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id="toc-Multiples-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Conventions_in_the_electric_power_industry" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Conventions_in_the_electric_power_industry"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Conventions in the electric power industry</span> </div> </a> <ul id="toc-Conventions_in_the_electric_power_industry-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Radio_transmission" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Radio_transmission"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Radio transmission</span> </div> </a> <ul id="toc-Radio_transmission-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Distinction_between_watts_and_watt-hours" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Distinction_between_watts_and_watt-hours"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Distinction between watts and watt-hours</span> </div> </a> <ul id="toc-Distinction_between_watts_and_watt-hours-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Explanatory_notes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Explanatory_notes"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Explanatory notes</span> </div> </a> <ul id="toc-Explanatory_notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Watt</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 111 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-111" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">111 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%88%D8%A7%D8%B7" title="واط – Arabic" lang="ar" hreflang="ar" data-title="واط" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Watt" title="Watt – Aragonese" lang="an" hreflang="an" data-title="Watt" data-language-autonym="Aragonés" data-language-local-name="Aragonese" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Vatiu" title="Vatiu – Asturian" lang="ast" hreflang="ast" data-title="Vatiu" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Vatt" title="Vatt – Azerbaijani" lang="az" hreflang="az" data-title="Vatt" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%93%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%9F" title="ওয়াট – Bangla" lang="bn" hreflang="bn" data-title="ওয়াট" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/%C3%93a" title="Óa – Minnan" lang="nan" hreflang="nan" data-title="Óa" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Bashkir" lang="ba" hreflang="ba" data-title="Ватт" data-language-autonym="Башҡортса" data-language-local-name="Bashkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%92%D0%B0%D1%82_(%D0%B0%D0%B4%D0%B7%D1%96%D0%BD%D0%BA%D0%B0_%D0%B2%D1%8B%D0%BC%D1%8F%D1%80%D1%8D%D0%BD%D0%BD%D1%8F)" title="Ват (адзінка вымярэння) – Belarusian" lang="be" hreflang="be" data-title="Ват (адзінка вымярэння)" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%92%D0%B0%D1%82" title="Ват – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Ват" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%92%D0%B0%D1%82" title="Ват – Bulgarian" lang="bg" hreflang="bg" data-title="Ват" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%9D%E0%BC%8B%E0%BD%90%E0%BD%B2%E0%BC%8D" title="ཝ་ཐི། – Tibetan" lang="bo" hreflang="bo" data-title="ཝ་ཐི།" data-language-autonym="བོད་ཡིག" data-language-local-name="Tibetan" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Vat" title="Vat – Bosnian" lang="bs" hreflang="bs" data-title="Vat" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Watt" title="Watt – Breton" lang="br" hreflang="br" data-title="Watt" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Watt" title="Watt – Catalan" lang="ca" hreflang="ca" data-title="Watt" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Chuvash" lang="cv" hreflang="cv" data-title="Ватт" data-language-autonym="Чӑвашла" data-language-local-name="Chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Watt" title="Watt – Czech" lang="cs" hreflang="cs" data-title="Watt" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Wat" title="Wat – Welsh" lang="cy" hreflang="cy" data-title="Wat" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Watt" title="Watt – Danish" lang="da" hreflang="da" data-title="Watt" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Watt_(Einheit)" title="Watt (Einheit) – German" lang="de" hreflang="de" data-title="Watt (Einheit)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Vatt" title="Vatt – Estonian" lang="et" hreflang="et" data-title="Vatt" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%92%CE%B1%CF%84_(%CE%BC%CE%BF%CE%BD%CE%AC%CE%B4%CE%B1_%CE%BC%CE%AD%CF%84%CF%81%CE%B7%CF%83%CE%B7%CF%82)" title="Βατ (μονάδα μέτρησης) – Greek" lang="el" hreflang="el" data-title="Βατ (μονάδα μέτρησης)" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Vatio" title="Vatio – Spanish" lang="es" hreflang="es" data-title="Vatio" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Vato_(mezurunuo)" title="Vato (mezurunuo) – Esperanto" lang="eo" hreflang="eo" data-title="Vato (mezurunuo)" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Watt" title="Watt – Basque" lang="eu" hreflang="eu" data-title="Watt" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%88%D8%A7%D8%AA" title="وات – Persian" lang="fa" hreflang="fa" data-title="وات" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-hif mw-list-item"><a href="https://hif.wikipedia.org/wiki/Watt" title="Watt – Fiji Hindi" lang="hif" hreflang="hif" data-title="Watt" data-language-autonym="Fiji Hindi" data-language-local-name="Fiji Hindi" class="interlanguage-link-target"><span>Fiji Hindi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Watt" title="Watt – French" lang="fr" hreflang="fr" data-title="Watt" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Watt_(ienheid)" title="Watt (ienheid) – Western Frisian" lang="fy" hreflang="fy" data-title="Watt (ienheid)" data-language-autonym="Frysk" data-language-local-name="Western Frisian" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-fur mw-list-item"><a href="https://fur.wikipedia.org/wiki/Wat" title="Wat – Friulian" lang="fur" hreflang="fur" data-title="Wat" data-language-autonym="Furlan" data-language-local-name="Friulian" class="interlanguage-link-target"><span>Furlan</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Vata" title="Vata – Irish" lang="ga" hreflang="ga" data-title="Vata" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Watt" title="Watt – Galician" lang="gl" hreflang="gl" data-title="Watt" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/%E7%93%A6" title="瓦 – Gan" lang="gan" hreflang="gan" data-title="瓦" data-language-autonym="贛語" data-language-local-name="Gan" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%99%80%ED%8A%B8" title="와트 – Korean" lang="ko" hreflang="ko" data-title="와트" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8E%D5%A1%D5%BF%D5%BF_(%D5%B9%D5%A1%D6%83%D5%B4%D5%A1%D5%B6_%D5%B4%D5%AB%D5%A1%D5%BE%D5%B8%D6%80)" title="Վատտ (չափման միավոր) – Armenian" lang="hy" hreflang="hy" data-title="Վատտ (չափման միավոր)" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B5%E0%A5%89%E0%A4%9F" title="वॉट – Hindi" lang="hi" hreflang="hi" data-title="वॉट" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Vat" title="Vat – Croatian" lang="hr" hreflang="hr" data-title="Vat" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Wato" title="Wato – Ido" lang="io" hreflang="io" data-title="Wato" data-language-autonym="Ido" data-language-local-name="Ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Watt" title="Watt – Indonesian" lang="id" hreflang="id" data-title="Watt" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Watt" title="Watt – Interlingua" lang="ia" hreflang="ia" data-title="Watt" data-language-autonym="Interlingua" data-language-local-name="Interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Vatt" title="Vatt – Icelandic" lang="is" hreflang="is" data-title="Vatt" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Watt" title="Watt – Italian" lang="it" hreflang="it" data-title="Watt" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%95%D7%90%D7%98" title="ואט – Hebrew" lang="he" hreflang="he" data-title="ואט" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-krc mw-list-item"><a href="https://krc.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Karachay-Balkar" lang="krc" hreflang="krc" data-title="Ватт" data-language-autonym="Къарачай-малкъар" data-language-local-name="Karachay-Balkar" class="interlanguage-link-target"><span>Къарачай-малкъар</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%95%E1%83%90%E1%83%A2%E1%83%98" title="ვატი – Georgian" lang="ka" hreflang="ka" data-title="ვატი" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Kazakh" lang="kk" hreflang="kk" data-title="Ватт" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kw mw-list-item"><a href="https://kw.wikipedia.org/wiki/Watt" title="Watt – Cornish" lang="kw" hreflang="kw" data-title="Watt" data-language-autonym="Kernowek" data-language-local-name="Cornish" class="interlanguage-link-target"><span>Kernowek</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Wati" title="Wati – Swahili" lang="sw" hreflang="sw" data-title="Wati" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Wat" title="Wat – Haitian Creole" lang="ht" hreflang="ht" data-title="Wat" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitian Creole" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Watt" title="Watt – Kurdish" lang="ku" hreflang="ku" data-title="Watt" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Kyrgyz" lang="ky" hreflang="ky" data-title="Ватт" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Vattium" title="Vattium – Latin" lang="la" hreflang="la" data-title="Vattium" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Vats" title="Vats – Latvian" lang="lv" hreflang="lv" data-title="Vats" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Vatas" title="Vatas – Lithuanian" lang="lt" hreflang="lt" data-title="Vatas" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Watt" title="Watt – Limburgish" lang="li" hreflang="li" data-title="Watt" data-language-autonym="Limburgs" data-language-local-name="Limburgish" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Watt" title="Watt – Lombard" lang="lmo" hreflang="lmo" data-title="Watt" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Watt_(m%C3%A9rt%C3%A9kegys%C3%A9g)" title="Watt (mértékegység) – Hungarian" lang="hu" hreflang="hu" data-title="Watt (mértékegység)" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%92%D0%B0%D1%82" title="Ват – Macedonian" lang="mk" hreflang="mk" data-title="Ват" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B5%E0%B4%BE%E0%B4%9F%E0%B5%8D%E0%B4%9F%E0%B5%8D" title="വാട്ട് – Malayalam" lang="ml" hreflang="ml" data-title="വാട്ട്" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%B5%E0%A5%85%E0%A4%9F" title="वॅट – Marathi" lang="mr" hreflang="mr" data-title="वॅट" data-language-autonym="मराठी" data-language-local-name="Marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D9%88%D8%A7%D8%AA" title="وات – Egyptian Arabic" lang="arz" hreflang="arz" data-title="وات" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Watt" title="Watt – Malay" lang="ms" hreflang="ms" data-title="Watt" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82_(%D0%BD%D1%8D%D0%B3%D0%B6)" title="Ватт (нэгж) – Mongolian" lang="mn" hreflang="mn" data-title="Ватт (нэгж)" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%9D%E1%80%95%E1%80%BA" title="ဝပ် – Burmese" lang="my" hreflang="my" data-title="ဝပ်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Watt_(eenheid)" title="Watt (eenheid) – Dutch" lang="nl" hreflang="nl" data-title="Watt (eenheid)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%B5%E0%A4%BE%E0%A4%9F" title="वाट – Nepali" lang="ne" hreflang="ne" data-title="वाट" data-language-autonym="नेपाली" data-language-local-name="Nepali" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-new mw-list-item"><a href="https://new.wikipedia.org/wiki/%E0%A4%B5%E0%A4%BE%E0%A4%9F" title="वाट – Newari" lang="new" hreflang="new" data-title="वाट" data-language-autonym="नेपाल भाषा" data-language-local-name="Newari" class="interlanguage-link-target"><span>नेपाल भाषा</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%AF%E3%83%83%E3%83%88" title="ワット – Japanese" lang="ja" hreflang="ja" data-title="ワット" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Watt_(ianhaid)" title="Watt (ianhaid) – Northern Frisian" lang="frr" hreflang="frr" data-title="Watt (ianhaid)" data-language-autonym="Nordfriisk" data-language-local-name="Northern Frisian" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Watt" title="Watt – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Watt" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Watt" title="Watt – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Watt" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Watt" title="Watt – Occitan" lang="oc" hreflang="oc" data-title="Watt" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Vatt" title="Vatt – Uzbek" lang="uz" hreflang="uz" data-title="Vatt" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%B5%E0%A8%BE%E0%A8%9F" title="ਵਾਟ – Punjabi" lang="pa" hreflang="pa" data-title="ਵਾਟ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D9%88%D8%A7%D9%B9" title="واٹ – Western Punjabi" lang="pnb" hreflang="pnb" data-title="واٹ" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-jam mw-list-item"><a href="https://jam.wikipedia.org/wiki/Wat" title="Wat – Jamaican Creole English" lang="jam" hreflang="jam" data-title="Wat" data-language-autonym="Patois" data-language-local-name="Jamaican Creole English" class="interlanguage-link-target"><span>Patois</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Watt" title="Watt – Piedmontese" lang="pms" hreflang="pms" data-title="Watt" data-language-autonym="Piemontèis" data-language-local-name="Piedmontese" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wat" title="Wat – Polish" lang="pl" hreflang="pl" data-title="Wat" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Watt" title="Watt – Portuguese" lang="pt" hreflang="pt" data-title="Watt" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Watt" title="Watt – Romanian" lang="ro" hreflang="ro" data-title="Watt" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Russian" lang="ru" hreflang="ru" data-title="Ватт" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Yakut" lang="sah" hreflang="sah" data-title="Ватт" data-language-autonym="Саха тыла" data-language-local-name="Yakut" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-sc mw-list-item"><a href="https://sc.wikipedia.org/wiki/Watt" title="Watt – Sardinian" lang="sc" hreflang="sc" data-title="Watt" data-language-autonym="Sardu" data-language-local-name="Sardinian" class="interlanguage-link-target"><span>Sardu</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Watt" title="Watt – Scots" lang="sco" hreflang="sco" data-title="Watt" data-language-autonym="Scots" data-language-local-name="Scots" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Vati" title="Vati – Albanian" lang="sq" hreflang="sq" data-title="Vati" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Watt" title="Watt – Sicilian" lang="scn" hreflang="scn" data-title="Watt" data-language-autonym="Sicilianu" data-language-local-name="Sicilian" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Watt" title="Watt – Simple English" lang="en-simple" hreflang="en-simple" data-title="Watt" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Watt_(jednotka)" title="Watt (jednotka) – Slovak" lang="sk" hreflang="sk" data-title="Watt (jednotka)" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Vat" title="Vat – Slovenian" lang="sl" hreflang="sl" data-title="Vat" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%88%D8%A7%D8%AA" title="وات – Central Kurdish" lang="ckb" hreflang="ckb" data-title="وات" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%92%D0%B0%D1%82" title="Ват – Serbian" lang="sr" hreflang="sr" data-title="Ват" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Vat" title="Vat – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Vat" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Watti" title="Watti – Finnish" lang="fi" hreflang="fi" data-title="Watti" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Watt" title="Watt – Swedish" lang="sv" hreflang="sv" data-title="Watt" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Watt" title="Watt – Tagalog" lang="tl" hreflang="tl" data-title="Watt" data-language-autonym="Tagalog" data-language-local-name="Tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B5%E0%AE%BE%E0%AE%9F%E0%AF%8D%E0%AE%9F%E0%AF%81_(%E0%AE%85%E0%AE%B2%E0%AE%95%E0%AF%81)" title="வாட்டு (அலகு) – Tamil" lang="ta" hreflang="ta" data-title="வாட்டு (அலகு)" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-roa-tara mw-list-item"><a href="https://roa-tara.wikipedia.org/wiki/Watt" title="Watt – Tarantino" lang="nap-x-tara" hreflang="nap-x-tara" data-title="Watt" data-language-autonym="Tarandíne" data-language-local-name="Tarantino" class="interlanguage-link-target"><span>Tarandíne</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Tatar" lang="tt" hreflang="tt" data-title="Ватт" data-language-autonym="Татарча / tatarça" data-language-local-name="Tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%B5%E0%B0%BE%E0%B0%9F%E0%B1%8D" title="వాట్ – Telugu" lang="te" hreflang="te" data-title="వాట్" data-language-autonym="తెలుగు" data-language-local-name="Telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A7%E0%B8%B1%E0%B8%95%E0%B8%95%E0%B9%8C" title="วัตต์ – Thai" lang="th" hreflang="th" data-title="วัตต์" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Watt" title="Watt – Turkish" lang="tr" hreflang="tr" data-title="Watt" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tyv mw-list-item"><a href="https://tyv.wikipedia.org/wiki/%D0%92%D0%B0%D1%82%D1%82" title="Ватт – Tuvinian" lang="tyv" hreflang="tyv" data-title="Ватт" data-language-autonym="Тыва дыл" data-language-local-name="Tuvinian" class="interlanguage-link-target"><span>Тыва дыл</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%92%D0%B0%D1%82" title="Ват – Ukrainian" lang="uk" hreflang="uk" data-title="Ват" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D9%88%D8%A7%D9%B9" title="واٹ – Urdu" lang="ur" hreflang="ur" data-title="واٹ" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vec mw-list-item"><a href="https://vec.wikipedia.org/wiki/Watt" title="Watt – Venetian" lang="vec" hreflang="vec" data-title="Watt" data-language-autonym="Vèneto" data-language-local-name="Venetian" class="interlanguage-link-target"><span>Vèneto</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Watt" title="Watt – Vietnamese" lang="vi" hreflang="vi" data-title="Watt" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Watt" title="Watt – Waray" lang="war" hreflang="war" data-title="Watt" data-language-autonym="Winaray" data-language-local-name="Waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E7%93%A6%E7%89%B9" title="瓦特 – Wu" lang="wuu" hreflang="wuu" data-title="瓦特" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E7%93%A6_(%E5%96%AE%E4%BD%8D)" title="瓦 (單位) – Cantonese" lang="yue" hreflang="yue" data-title="瓦 (單位)" data-language-autonym="粵語" data-language-local-name="Cantonese" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/Watt" title="Watt – Zazaki" lang="diq" hreflang="diq" data-title="Watt" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-bat-smg mw-list-item"><a href="https://bat-smg.wikipedia.org/wiki/Vats" 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class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">SI derived unit of power</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about the unit of power. For other uses, see <a href="/wiki/Watt_(disambiguation)" class="mw-disambig" title="Watt (disambiguation)">Watt (disambiguation)</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">"MWT" redirects here. For the former Australian theatre company, see <a href="/wiki/Melbourne_Workers_Theatre" title="Melbourne Workers Theatre">Melbourne Workers Theatre</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">"Joules per second" redirects here, it should not be confused with <a href="/wiki/Joule-second" title="Joule-second">Joule-second</a></div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox ib-unit"><tbody><tr><th colspan="2" class="infobox-above">watt</th></tr><tr><td colspan="2" class="infobox-image notheme" style="background-color: #f8f9fa;"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Alimentation_420_W.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9a/Alimentation_420_W.jpg/220px-Alimentation_420_W.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9a/Alimentation_420_W.jpg/330px-Alimentation_420_W.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9a/Alimentation_420_W.jpg/440px-Alimentation_420_W.jpg 2x" data-file-width="2592" data-file-height="1944" /></a></span><div class="infobox-caption">A 420-watt <a href="/wiki/Power_supply" title="Power supply">power supply</a></div></td></tr><tr><th colspan="2" class="infobox-header">General information</th></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/System_of_units_of_measurement" title="System of units of measurement">Unit system</a></th><td class="infobox-data"><a href="/wiki/SI" class="mw-redirect" title="SI">SI</a></td></tr><tr><th scope="row" class="infobox-label">Unit of</th><td class="infobox-data"><a href="/wiki/Power_(physics)" title="Power (physics)">power</a></td></tr><tr><th scope="row" class="infobox-label">Symbol</th><td class="infobox-data">W</td></tr><tr><th scope="row" class="infobox-label">Named after</th><td class="infobox-data"><a href="/wiki/James_Watt" title="James Watt">James Watt</a></td></tr><tr><th colspan="2" class="infobox-header">Conversions </th></tr><tr class="nowrap"><td>1 W <i>in ...</i></td><td><i>... is equal to ...</i></td></tr><tr style="display:none"><th colspan="2"> </th></tr><tr><th scope="row" class="infobox-label"><span class="nowrap">   </span><a href="/wiki/SI_base_unit" title="SI base unit">SI base units</a></th><td class="infobox-data"><span class="nowrap">   </span>1 <a href="/wiki/Kg" class="mw-redirect" title="Kg">kg</a>⋅<a href="/wiki/Metre" title="Metre">m</a><sup>2</sup>⋅<a href="/wiki/Second" title="Second">s</a><sup>−3</sup></td></tr><tr><th scope="row" class="infobox-label"><span class="nowrap">   </span><a href="/wiki/CGS_unit" class="mw-redirect" title="CGS unit">CGS units</a></th><td class="infobox-data"><span class="nowrap">   </span><span class="nowrap"><span data-sort-value="7007100000000000000♠"></span>10<sup>7</sup> <a href="/wiki/Erg" title="Erg">erg</a>⋅<a href="/wiki/Second" title="Second">s</a><sup>−1</sup></span></td></tr><tr><th scope="row" class="infobox-label"><span class="nowrap">   </span><a href="/wiki/English_Engineering_Units" title="English Engineering Units">English Engineering Units</a></th><td class="infobox-data"><span class="nowrap">   </span>0.7375621 ft⋅lbf/s = 0.001341022 hp</td></tr></tbody></table><style data-mw-deduplicate="TemplateStyles:r1236303919">@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-has-images-with-white-backgrounds img{background:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-has-images-with-white-backgrounds img{background:white}}</style> <style 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.sidebar-content-with-subgroup{padding:0.1em 0.4em 0.2em}.mw-parser-output .sidebar-above,.mw-parser-output .sidebar-below{padding:0.3em 0.8em;font-weight:bold}.mw-parser-output .sidebar-collapse .sidebar-above,.mw-parser-output .sidebar-collapse .sidebar-below{border-top:1px solid #aaa;border-bottom:1px solid #aaa}.mw-parser-output .sidebar-navbar{text-align:right;font-size:115%;padding:0 0.4em 0.4em}.mw-parser-output .sidebar-list-title{padding:0 0.4em;text-align:left;font-weight:bold;line-height:1.6em;font-size:105%}.mw-parser-output .sidebar-list-title-c{padding:0 0.4em;text-align:center;margin:0 3.3em}@media(max-width:640px){body.mediawiki .mw-parser-output .sidebar{width:100%!important;clear:both;float:none!important;margin-left:0!important;margin-right:0!important}}body.skin--responsive .mw-parser-output .sidebar a>img{max-width:none!important}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar sidebar-collapse nomobile nowraplinks"><tbody><tr><td class="sidebar-pretitle">Articles about</td></tr><tr><th class="sidebar-title-with-pretitle"><a href="/wiki/Electromagnetism" title="Electromagnetism">Electromagnetism</a></th></tr><tr><td class="sidebar-image"><span typeof="mw:File/Frameless"><a href="/wiki/File:VFPt_Solenoid_correct2.svg" class="mw-file-description" title="Solenoid"><img alt="Solenoid" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/VFPt_Solenoid_correct2.svg/190px-VFPt_Solenoid_correct2.svg.png" decoding="async" width="190" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/VFPt_Solenoid_correct2.svg/285px-VFPt_Solenoid_correct2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0d/VFPt_Solenoid_correct2.svg/380px-VFPt_Solenoid_correct2.svg.png 2x" data-file-width="490" data-file-height="200" /></a></span></td></tr><tr><td class="sidebar-content hlist"> <ul><li><a href="/wiki/Electricity" title="Electricity">Electricity</a></li> <li><a href="/wiki/Magnetism" title="Magnetism">Magnetism</a></li> <li><a href="/wiki/Optics" title="Optics">Optics</a></li> <li><a href="/wiki/History_of_electromagnetic_theory" title="History of electromagnetic theory">History</a></li> <li><a href="/wiki/Computational_electromagnetics" title="Computational electromagnetics">Computational</a></li> <li><a href="/wiki/List_of_textbooks_in_electromagnetism" title="List of textbooks in electromagnetism">Textbooks</a></li> <li><a href="/wiki/List_of_electrical_phenomena" title="List of electrical phenomena">Phenomena</a></li></ul></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)"><a href="/wiki/Electrostatics" title="Electrostatics">Electrostatics</a></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Charge_density" title="Charge density">Charge density</a></li> <li><a href="/wiki/Electrical_conductor" title="Electrical conductor">Conductor</a></li> <li><a href="/wiki/Coulomb%27s_law" title="Coulomb's law">Coulomb law</a></li> <li><a href="/wiki/Electret" title="Electret">Electret</a></li> <li><a href="/wiki/Electric_charge" title="Electric charge">Electric charge</a></li> <li><a href="/wiki/Electric_dipole_moment" title="Electric dipole moment">Electric dipole</a></li> <li><a href="/wiki/Electric_field" title="Electric field">Electric field</a></li> <li><a href="/wiki/Electric_flux" title="Electric flux">Electric flux</a></li> <li><a href="/wiki/Electric_potential" title="Electric potential">Electric potential</a></li> <li><a href="/wiki/Electrostatic_discharge" title="Electrostatic discharge">Electrostatic discharge</a></li> <li><a href="/wiki/Electrostatic_induction" title="Electrostatic induction">Electrostatic induction</a></li> <li><a href="/wiki/Gauss%27s_law" title="Gauss's law">Gauss law</a></li> <li><a href="/wiki/Insulator_(electricity)" title="Insulator (electricity)">Insulator</a></li> <li><a href="/wiki/Permittivity" title="Permittivity">Permittivity</a></li> <li><a href="/wiki/Polarization_density" title="Polarization density">Polarization</a></li> <li><a href="/wiki/Electric_potential_energy" title="Electric potential energy">Potential energy</a></li> <li><a href="/wiki/Static_electricity" title="Static electricity">Static electricity</a></li> <li><a href="/wiki/Triboelectric_effect" title="Triboelectric effect">Triboelectricity</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)"><a href="/wiki/Magnetostatics" title="Magnetostatics">Magnetostatics</a></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Amp%C3%A8re%27s_circuital_law" title="Ampère's circuital law">Ampère law</a></li> <li><a href="/wiki/Biot%E2%80%93Savart_law" title="Biot–Savart law">Biot–Savart law</a></li> <li><a href="/wiki/Gauss%27s_law_for_magnetism" title="Gauss's law for magnetism">Gauss magnetic law</a></li> <li><a href="/wiki/Magnetic_moment" title="Magnetic moment">Magnetic dipole</a></li> <li><a href="/wiki/Magnetic_field" title="Magnetic field">Magnetic field</a></li> <li><a href="/wiki/Magnetic_flux" title="Magnetic flux">Magnetic flux</a></li> <li><a href="/wiki/Magnetic_scalar_potential" title="Magnetic scalar potential">Magnetic scalar potential</a></li> <li><a href="/wiki/Magnetic_vector_potential" title="Magnetic vector potential">Magnetic vector potential</a></li> <li><a href="/wiki/Magnetization" title="Magnetization">Magnetization</a></li> <li><a href="/wiki/Permeability_(electromagnetism)" title="Permeability (electromagnetism)">Permeability</a></li> <li><a href="/wiki/Right-hand_rule#Electromagnetism" title="Right-hand rule">Right-hand rule</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)"><a href="/wiki/Classical_electromagnetism" title="Classical electromagnetism">Electrodynamics</a></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Bremsstrahlung" title="Bremsstrahlung">Bremsstrahlung</a></li> <li><a href="/wiki/Cyclotron_radiation" title="Cyclotron radiation">Cyclotron radiation</a></li> <li><a href="/wiki/Displacement_current" title="Displacement current">Displacement current</a></li> <li><a href="/wiki/Eddy_current" title="Eddy current">Eddy current</a></li> <li><a href="/wiki/Electromagnetic_field" title="Electromagnetic field">Electromagnetic field</a></li> <li><a href="/wiki/Electromagnetic_induction" title="Electromagnetic induction">Electromagnetic induction</a></li> <li><a href="/wiki/Electromagnetic_pulse" title="Electromagnetic pulse">Electromagnetic pulse</a></li> <li><a href="/wiki/Electromagnetic_radiation" title="Electromagnetic radiation">Electromagnetic radiation</a></li> <li><a href="/wiki/Faraday%27s_law_of_induction" title="Faraday's law of induction">Faraday law</a></li> <li><a href="/wiki/Jefimenko%27s_equations" title="Jefimenko's equations">Jefimenko equations</a></li> <li><a href="/wiki/Larmor_formula" title="Larmor formula">Larmor formula</a></li> <li><a href="/wiki/Lenz%27s_law" title="Lenz's law">Lenz law</a></li> <li><a href="/wiki/Li%C3%A9nard%E2%80%93Wiechert_potential" title="Liénard–Wiechert potential">Liénard–Wiechert potential</a></li> <li><a href="/wiki/London_equations" title="London equations">London equations</a></li> <li><a href="/wiki/Lorentz_force" title="Lorentz force">Lorentz force</a></li> <li><a href="/wiki/Maxwell%27s_equations" title="Maxwell's equations">Maxwell equations</a></li> <li><a href="/wiki/Maxwell_stress_tensor" title="Maxwell stress tensor">Maxwell tensor</a></li> <li><a href="/wiki/Poynting_vector" title="Poynting vector">Poynting vector</a></li> <li><a href="/wiki/Synchrotron_radiation" title="Synchrotron radiation">Synchrotron radiation</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)"><a href="/wiki/Electrical_network" title="Electrical network">Electrical network</a></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Alternating_current" title="Alternating current">Alternating current</a></li> <li><a href="/wiki/Capacitance" title="Capacitance">Capacitance</a></li> <li><a href="/wiki/Current_density" title="Current density">Current density</a></li> <li><a href="/wiki/Direct_current" title="Direct current">Direct current</a></li> <li><a href="/wiki/Electric_current" title="Electric current">Electric current</a></li> <li><a href="/wiki/Electric_power" title="Electric power">Electric power</a></li> <li><a href="/wiki/Electrolysis" title="Electrolysis">Electrolysis</a></li> <li><a href="/wiki/Electromotive_force" title="Electromotive force">Electromotive force</a></li> <li><a href="/wiki/Electrical_impedance" title="Electrical impedance">Impedance</a></li> <li><a href="/wiki/Inductance" title="Inductance">Inductance</a></li> <li><a href="/wiki/Joule_heating" title="Joule heating">Joule heating</a></li> <li><a href="/wiki/Kirchhoff%27s_circuit_laws" title="Kirchhoff's circuit laws">Kirchhoff laws</a></li> <li><a href="/wiki/Network_analysis_(electrical_circuits)" title="Network analysis (electrical circuits)">Network analysis</a></li> <li><a href="/wiki/Ohm%27s_law" title="Ohm's law">Ohm law</a></li> <li><a href="/wiki/Series_and_parallel_circuits#Parallel_circuits" title="Series and parallel circuits">Parallel circuit</a></li> <li><a href="/wiki/Electrical_resistance_and_conductance" title="Electrical resistance and conductance">Resistance</a></li> <li><a href="/wiki/Resonator#Electromagnetics" title="Resonator">Resonant cavities</a></li> <li><a href="/wiki/Series_and_parallel_circuits#Series_circuits" title="Series and parallel circuits">Series circuit</a></li> <li><a href="/wiki/Voltage" title="Voltage">Voltage</a></li> <li><a class="mw-selflink selflink">Watt</a></li> <li><a href="/wiki/Waveguide_(radio_frequency)" title="Waveguide (radio frequency)">Waveguides</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)"><a href="/wiki/Magnetic_circuit" title="Magnetic circuit">Magnetic circuit</a></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/AC_motor" title="AC motor">AC motor</a></li> <li><a href="/wiki/DC_motor" title="DC motor">DC motor</a></li> <li><a href="/wiki/Electric_machine" title="Electric machine">Electric machine</a></li> <li><a href="/wiki/Electric_motor" title="Electric motor">Electric motor</a></li> <li><a href="/wiki/Gyrator%E2%80%93capacitor_model" title="Gyrator–capacitor model">Gyrator–capacitor</a></li> <li><a href="/wiki/Induction_motor" title="Induction motor">Induction motor</a></li> <li><a href="/wiki/Linear_motor" title="Linear motor">Linear motor</a></li> <li><a href="/wiki/Magnetomotive_force" title="Magnetomotive force">Magnetomotive force</a></li> <li><a href="/wiki/Permeance" title="Permeance">Permeance</a></li> <li><a href="/wiki/Magnetic_complex_reluctance" title="Magnetic complex reluctance">Reluctance (complex)</a></li> <li><a href="/wiki/Magnetic_reluctance" title="Magnetic reluctance">Reluctance (real)</a></li> <li><a href="/wiki/Rotor_(electric)" title="Rotor (electric)">Rotor</a></li> <li><a href="/wiki/Stator" title="Stator">Stator</a></li> <li><a href="/wiki/Transformer" title="Transformer">Transformer</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)"><a href="/wiki/Covariant_formulation_of_classical_electromagnetism" title="Covariant formulation of classical electromagnetism">Covariant formulation</a></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Electromagnetic_tensor" title="Electromagnetic tensor">Electromagnetic tensor</a></li> <li><a href="/wiki/Classical_electromagnetism_and_special_relativity" title="Classical electromagnetism and special relativity">Electromagnetism and special relativity</a></li> <li><a href="/wiki/Four-current" title="Four-current">Four-current</a></li> <li><a href="/wiki/Electromagnetic_four-potential" title="Electromagnetic four-potential">Four-potential</a></li> <li><a href="/wiki/Mathematical_descriptions_of_the_electromagnetic_field" title="Mathematical descriptions of the electromagnetic field">Mathematical descriptions</a></li> <li><a href="/wiki/Maxwell%27s_equations_in_curved_spacetime" title="Maxwell's equations in curved spacetime">Maxwell equations in curved spacetime</a></li> <li><a href="/wiki/Relativistic_electromagnetism" title="Relativistic electromagnetism">Relativistic electromagnetism</a></li> <li><a href="/wiki/Electromagnetic_stress%E2%80%93energy_tensor" title="Electromagnetic stress–energy tensor">Stress–energy tensor</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content hlist"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:transparent;border-top:1px solid #aaa;text-align:center;;color: var(--color-base)">Scientists</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Andr%C3%A9-Marie_Amp%C3%A8re" title="André-Marie Ampère">Ampère</a></li> <li><a href="/wiki/Jean-Baptiste_Biot" title="Jean-Baptiste Biot">Biot</a></li> <li><a href="/wiki/Charles-Augustin_de_Coulomb" title="Charles-Augustin de Coulomb">Coulomb</a></li> <li><a href="/wiki/Humphry_Davy" title="Humphry Davy">Davy</a></li> <li><a href="/wiki/Albert_Einstein" title="Albert Einstein">Einstein</a></li> <li><a href="/wiki/Michael_Faraday" title="Michael Faraday">Faraday</a></li> <li><a href="/wiki/Hippolyte_Fizeau" title="Hippolyte Fizeau">Fizeau</a></li> <li><a href="/wiki/Carl_Friedrich_Gauss" title="Carl Friedrich Gauss">Gauss</a></li> <li><a href="/wiki/Oliver_Heaviside" title="Oliver Heaviside">Heaviside</a></li> <li><a href="/wiki/Hermann_von_Helmholtz" title="Hermann von Helmholtz">Helmholtz</a></li> <li><a href="/wiki/Joseph_Henry" title="Joseph Henry">Henry</a></li> <li><a href="/wiki/Heinrich_Hertz" title="Heinrich Hertz">Hertz</a></li> <li><a href="/wiki/John_Hopkinson" title="John Hopkinson">Hopkinson</a></li> <li><a href="/wiki/Oleg_D._Jefimenko" title="Oleg D. Jefimenko">Jefimenko</a></li> <li><a href="/wiki/James_Prescott_Joule" title="James Prescott Joule">Joule</a></li> <li><a href="/wiki/Lord_Kelvin" title="Lord Kelvin">Kelvin</a></li> <li><a href="/wiki/Gustav_Kirchhoff" title="Gustav Kirchhoff">Kirchhoff</a></li> <li><a href="/wiki/Joseph_Larmor" title="Joseph Larmor">Larmor</a></li> <li><a href="/wiki/Emil_Lenz" title="Emil Lenz">Lenz</a></li> <li><a href="/wiki/Alfred-Marie_Li%C3%A9nard" title="Alfred-Marie Liénard">Liénard</a></li> <li><a href="/wiki/Hendrik_Lorentz" title="Hendrik Lorentz">Lorentz</a></li> <li><a href="/wiki/James_Clerk_Maxwell" title="James Clerk Maxwell">Maxwell</a></li> <li><a href="/wiki/Franz_Ernst_Neumann" title="Franz Ernst Neumann">Neumann</a></li> <li><a href="/wiki/Georg_Ohm" title="Georg Ohm">Ohm</a></li> <li><a href="/wiki/Hans_Christian_%C3%98rsted" title="Hans Christian Ørsted">Ørsted</a></li> <li><a href="/wiki/Sim%C3%A9on_Denis_Poisson" title="Siméon Denis Poisson">Poisson</a></li> <li><a href="/wiki/John_Henry_Poynting" title="John Henry Poynting">Poynting</a></li> <li><a href="/wiki/William_Ritchie_(physicist)" title="William Ritchie (physicist)">Ritchie</a></li> <li><a href="/wiki/F%C3%A9lix_Savart" title="Félix Savart">Savart</a></li> <li><a href="/wiki/George_Singer" title="George Singer">Singer</a></li> <li><a href="/wiki/Charles_Proteus_Steinmetz" title="Charles Proteus Steinmetz">Steinmetz</a></li> <li><a href="/wiki/Nikola_Tesla" title="Nikola Tesla">Tesla</a></li> <li><a href="/wiki/J._J._Thomson" title="J. J. Thomson">Thomson</a></li> <li><a href="/wiki/Alessandro_Volta" title="Alessandro Volta">Volta</a></li> <li><a href="/wiki/Wilhelm_Eduard_Weber" title="Wilhelm Eduard Weber">Weber</a></li> <li><a href="/wiki/Emil_Wiechert" title="Emil Wiechert">Wiechert</a></li></ul></div></div></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Electromagnetism" title="Template:Electromagnetism"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Electromagnetism" title="Template talk:Electromagnetism"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Electromagnetism" title="Special:EditPage/Template:Electromagnetism"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p>The <b>watt</b> (symbol: <b>W</b>) is the unit of <a href="/wiki/Power_(physics)" title="Power (physics)">power</a> or <a href="/wiki/Radiant_flux" title="Radiant flux">radiant flux</a> in the <a href="/wiki/International_System_of_Units" title="International System of Units">International System of Units</a> (SI), equal to 1 <a href="/wiki/Joule" title="Joule">joule</a> per <a href="/wiki/Second" title="Second">second</a> or 1 kg⋅m<sup>2</sup>⋅s<sup>−3</sup>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It is used to <a href="/wiki/Quantification_(science)" title="Quantification (science)">quantify</a> the rate of <a href="/wiki/Work_(physics)" title="Work (physics)">energy transfer</a>. The watt is named in honor of <a href="/wiki/James_Watt" title="James Watt">James Watt</a> (1736–1819), an 18th-century <a href="/wiki/Scottish_people" title="Scottish people">Scottish</a> <a href="/wiki/Inventor" class="mw-redirect" title="Inventor">inventor</a>, <a href="/wiki/Mechanical_engineer" class="mw-redirect" title="Mechanical engineer">mechanical engineer</a>, and <a href="/wiki/Chemist" title="Chemist">chemist</a> who improved the <a href="/wiki/Newcomen_engine" class="mw-redirect" title="Newcomen engine">Newcomen engine</a> with his own <a href="/wiki/Watt_steam_engine" title="Watt steam engine">steam engine</a> in 1776. Watt's invention was fundamental for the <a href="/wiki/Industrial_Revolution" title="Industrial Revolution">Industrial Revolution</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Overview">Overview</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=1" title="Edit section: Overview"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When an object's <a href="/wiki/Velocity" title="Velocity">velocity</a> is held constant at one <a href="/wiki/Meter_per_second" class="mw-redirect" title="Meter per second">meter per second</a> against a constant opposing force of one <a href="/wiki/Newton_(unit)" title="Newton (unit)">newton</a>, the rate at which <a href="/wiki/Work_(physics)" title="Work (physics)">work</a> is done is one watt. <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1~W=1~J{/}s=1~N{\cdot }m{/}s=1~kg{\cdot }m^{2}{\cdot }s^{-3}} .}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">W</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">J</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> </mrow> <mi mathvariant="normal">s</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">N</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>⋅</mo> </mrow> <mi mathvariant="normal">m</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> </mrow> <mi mathvariant="normal">s</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">k</mi> <mi mathvariant="normal">g</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>⋅</mo> </mrow> <msup> <mi mathvariant="normal">m</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mrow class="MJX-TeXAtom-ORD"> <mo>⋅</mo> </mrow> <msup> <mi mathvariant="normal">s</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mn>3</mn> </mrow> </msup> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {1~W=1~J{/}s=1~N{\cdot }m{/}s=1~kg{\cdot }m^{2}{\cdot }s^{-3}} .}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/943e860ffad439da286c693ec86ab976be2ae3e9" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:38.904ex; height:3.176ex;" alt="{\displaystyle \mathrm {1~W=1~J{/}s=1~N{\cdot }m{/}s=1~kg{\cdot }m^{2}{\cdot }s^{-3}} .}"></span> </p><p>In terms of <a href="/wiki/Electromagnetism" title="Electromagnetism">electromagnetism</a>, one watt is the rate at which <a href="/wiki/Electrical_work" class="mw-redirect" title="Electrical work">electrical work</a> is performed when a current of one <a href="/wiki/Ampere" title="Ampere">ampere</a> (A) flows across an electrical <a href="/wiki/Potential_difference" class="mw-redirect" title="Potential difference">potential difference</a> of one <a href="/wiki/Volt" title="Volt">volt</a> (V), meaning the watt is equivalent to the <a href="/wiki/Volt-ampere" title="Volt-ampere">volt-ampere</a> (the latter unit, however, is used for a different quantity from the <a href="/wiki/Real_power" class="mw-redirect" title="Real power">real power</a> of an electrical circuit). <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1~W=1~V{\cdot }A} .}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">W</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">V</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>⋅</mo> </mrow> <mi mathvariant="normal">A</mi> </mrow> <mo>.</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {1~W=1~V{\cdot }A} .}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/658572a9f9306003ffc571fc5ee578c9132266e8" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:13.753ex; height:2.176ex;" alt="{\displaystyle \mathrm {1~W=1~V{\cdot }A} .}"></span> </p><p>Two additional <a href="/wiki/Unit_conversion" class="mw-redirect" title="Unit conversion">unit conversions</a> for watt can be found using the above equation and <a href="/wiki/Ohm%27s_law" title="Ohm's law">Ohm's law</a>. <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {1~W=1~V^{2}/\Omega =1~A^{2}{\cdot }\Omega } ,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mtext> </mtext> <mi mathvariant="normal">W</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <msup> <mi mathvariant="normal">V</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi mathvariant="normal">Ω</mi> <mo>=</mo> <mn>1</mn> <mtext> </mtext> <msup> <mi mathvariant="normal">A</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mrow class="MJX-TeXAtom-ORD"> <mo>⋅</mo> </mrow> <mi mathvariant="normal">Ω</mi> </mrow> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {1~W=1~V^{2}/\Omega =1~A^{2}{\cdot }\Omega } ,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/63a5bfb9d0f526a2efbe697bcce655e1915c27fd" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:25.222ex; height:3.176ex;" alt="{\displaystyle \mathrm {1~W=1~V^{2}/\Omega =1~A^{2}{\cdot }\Omega } ,}"></span> where <a href="/wiki/Ohm" title="Ohm">ohm</a> (<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \Omega }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Ω</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Omega }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/24b0d5ca6f381068d756f6337c08e0af9d1eeb6f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.678ex; height:2.176ex;" alt="{\displaystyle \Omega }"></span>) is the <a href="/wiki/SI_derived_unit" title="SI derived unit">SI derived unit</a> of <a href="/wiki/Electrical_resistance" class="mw-redirect" title="Electrical resistance">electrical resistance</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Examples">Examples</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=2" title="Edit section: Examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>A person having a mass of 100 kg who climbs a 3-meter-high ladder in 5 seconds is doing work at a rate of about 600 watts. Mass times acceleration due to <a href="/wiki/Gravity" title="Gravity">gravity</a> times height divided by the time it takes to lift the object to the given height gives the <i>rate of doing work</i> or <i>power</i>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>i<span class="cite-bracket">]</span></a></sup></li> <li>A laborer over the course of an eight-hour day can sustain an average output of about 75 watts; higher power levels can be achieved for short intervals and by athletes.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Origin_and_adoption_as_an_SI_unit">Origin and adoption as an SI unit</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=3" title="Edit section: Origin and adoption as an SI unit"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The watt is named after the Scottish inventor <a href="/wiki/James_Watt" title="James Watt">James Watt</a>.<sup id="cite_ref-Klein_6-0" class="reference"><a href="#cite_note-Klein-6"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The unit name was proposed by <a href="/wiki/Carl_Wilhelm_Siemens" title="Carl Wilhelm Siemens">C. William Siemens</a> in August 1882 in his President's Address to the Fifty-Second Congress of the <a href="/wiki/British_Association_for_the_Advancement_of_Science" class="mw-redirect" title="British Association for the Advancement of Science">British Association for the Advancement of Science</a>.<sup id="cite_ref-Siemens_7-0" class="reference"><a href="#cite_note-Siemens-7"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Noting that units in the <a href="/wiki/CGS#Practical_CGS_units" class="mw-redirect" title="CGS">practical system of units</a> were named after leading physicists, Siemens proposed that <i>watt</i> might be an appropriate name for a unit of power.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Siemens defined the unit within the existing system of practical units as "the power conveyed by a current of an <a href="/wiki/Ampere" title="Ampere">Ampère</a> through the difference of potential of a Volt".<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>In October 1908, at the International Conference on Electric Units and Standards in London,<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> so-called <i>international</i> definitions were established for practical electrical units.<sup id="cite_ref-EB11-742_11-0" class="reference"><a href="#cite_note-EB11-742-11"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Siemens' definition was adopted as the <i>international</i> watt. (Also used: <span class="nowrap">1 A<sup>2</sup> ×</span> 1 Ω.)<sup id="cite_ref-Klein_6-1" class="reference"><a href="#cite_note-Klein-6"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The watt was defined as equal to 10<sup>7</sup> units of power in the <i>practical system</i> of units.<sup id="cite_ref-EB11-742_11-1" class="reference"><a href="#cite_note-EB11-742-11"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/International_System_of_Electrical_and_Magnetic_Units#Overdefinition_and_the_1908_modification" title="International System of Electrical and Magnetic Units">"international units"</a> were dominant from 1909 until 1948. After the 9th <a href="/wiki/General_Conference_on_Weights_and_Measures" title="General Conference on Weights and Measures">General Conference on Weights and Measures</a> in 1948, the <i>international</i> watt was redefined from practical units to absolute units (i.e., using only length, mass, and time). Concretely, this meant that 1 watt was defined as the quantity of energy transferred in a unit of time, namely 1 J/s. In this new definition, 1 <i>absolute</i> watt = 1.00019 <i>international</i> watts. Texts written before 1948 are likely to be using the <i>international</i> watt, which implies caution when comparing numerical values from this period with the post-1948 watt.<sup id="cite_ref-Klein_6-2" class="reference"><a href="#cite_note-Klein-6"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> In 1960, the 11th General Conference on Weights and Measures adopted the <i>absolute</i> watt into the <a href="/wiki/International_System_of_Units" title="International System of Units">International System of Units</a> (SI) as the unit of power.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Multiples">Multiples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=4" title="Edit section: Multiples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">For additional examples of magnitude for multiples and submultiples of the watt, see <a href="/wiki/Orders_of_magnitude_(power)" title="Orders of magnitude (power)">Orders of magnitude (power)</a>.</div> <table class="wikitable" style="text-align:center; margin:0 auto;"> <caption>SI multiples of watt (W) </caption> <tbody><tr> <th scope="col" colspan="3">Submultiples </th> <th scope="col" colspan="3">Multiples </th></tr> <tr style="background:#d4d4d4;"> <th scope="col">Value </th> <th scope="col">SI symbol </th> <th scope="col">Name </th> <th scope="col">Value </th> <th scope="col">SI symbol </th> <th scope="col">Name </th></tr> <tr> <td>10<sup>−1</sup> W </td> <td>dW </td> <td>deciwatt </td> <td>10<sup>1</sup> W </td> <td>daW </td> <td>decawatt </td></tr> <tr> <td>10<sup>−2</sup> W </td> <td>cW </td> <td>centiwatt </td> <td>10<sup>2</sup> W </td> <td>hW </td> <td>hectowatt </td></tr> <tr> <td>10<sup>−3</sup> W </td> <td><b>mW</b> </td> <td><b>milliwatt</b> </td> <td>10<sup>3</sup> W </td> <td><b>kW</b> </td> <td><b>kilowatt</b> </td></tr> <tr> <td>10<sup>−6</sup> W </td> <td><b>μW</b> </td> <td><b>microwatt</b> </td> <td>10<sup>6</sup> W </td> <td><b>MW</b> </td> <td><b>megawatt</b> </td></tr> <tr> <td>10<sup>−9</sup> W </td> <td><b>nW</b> </td> <td><b>nanowatt</b> </td> <td>10<sup>9</sup> W </td> <td><b>GW</b> </td> <td><b>gigawatt</b> </td></tr> <tr> <td>10<sup>−12</sup> W </td> <td><b>pW</b> </td> <td><b>picowatt</b> </td> <td>10<sup>12</sup> W </td> <td><b>TW</b> </td> <td><b>terawatt</b> </td></tr> <tr> <td>10<sup>−15</sup> W </td> <td><b>fW</b> </td> <td><b>femtowatt</b> </td> <td>10<sup>15</sup> W </td> <td><b>PW</b> </td> <td><b>petawatt</b> </td></tr> <tr> <td>10<sup>−18</sup> W </td> <td>aW </td> <td>attowatt </td> <td>10<sup>18</sup> W </td> <td>EW </td> <td>exawatt </td></tr> <tr> <td>10<sup>−21</sup> W </td> <td>zW </td> <td>zeptowatt </td> <td>10<sup>21</sup> W </td> <td>ZW </td> <td>zettawatt </td></tr> <tr> <td>10<sup>−24</sup> W </td> <td>yW </td> <td>yoctowatt </td> <td>10<sup>24</sup> W </td> <td>YW </td> <td>yottawatt </td></tr> <tr> <td>10<sup>−27</sup> W </td> <td>rW </td> <td>rontowatt </td> <td>10<sup>27</sup> W </td> <td>RW </td> <td>ronnawatt </td></tr> <tr> <td>10<sup>−30</sup> W </td> <td>qW </td> <td>quectowatt </td> <td>10<sup>30</sup> W </td> <td>QW </td> <td>quettawatt </td></tr> <tr> <td colspan="6">Common multiples are in <b>bold</b> face </td></tr></tbody></table> <dl><dt><span id="Attowatt">Attowatt</span></dt> <dd>The sound intensity in water corresponding to the international standard reference <a href="/wiki/Sound_pressure" title="Sound pressure">sound pressure</a> of 1 <a href="/wiki/Micropascal" class="mw-redirect" title="Micropascal">μPa</a> is approximately 0.65 aW/m<sup>2</sup>.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></dd> <dt><span id="Femtowatt">Femtowatt</span></dt> <dd>Powers measured in femtowatts are typically found in references to <a href="/wiki/Radio" title="Radio">radio</a> and <a href="/wiki/Radar" title="Radar">radar</a> receivers. For example, meaningful <a href="/wiki/FM_tuner" class="mw-redirect" title="FM tuner">FM tuner</a> performance figures for sensitivity, quieting and <a href="/wiki/Signal-to-noise" class="mw-redirect" title="Signal-to-noise">signal-to-noise</a> require that the <a href="/wiki/RF" class="mw-redirect" title="RF">RF</a> energy applied to the antenna input be specified. These input levels are often stated in dBf (<a href="/wiki/Decibel" title="Decibel">decibels</a> referenced to 1 femtowatt). This is 0.2739 microvolts across a 75-ohm load or 0.5477 microvolt across a 300-ohm load; the specification takes into account the RF <a href="/wiki/Input_impedance" title="Input impedance">input impedance</a> of the tuner.</dd> <dt><span id="Picowatt">Picowatt</span></dt> <dd>Powers measured in picowatts are typically used in reference to radio and radar receivers, <a href="/wiki/Acoustics" title="Acoustics">acoustics</a> and in the science of <a href="/wiki/Radio_astronomy" title="Radio astronomy">radio astronomy</a>. One picowatt is the international standard reference value of <a href="/wiki/Sound_power" title="Sound power">sound power</a> when this quantity is expressed in decibels.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></dd> <dt><span id="Nanowatt">Nanowatt</span></dt> <dd>Powers measured in nanowatts are also typically used in reference to radio and radar receivers.</dd> <dt><span id="Microwatt">Microwatt</span></dt> <dd>Powers measured in microwatts are typically stated in <a href="/wiki/Medical_instrument" class="mw-redirect" title="Medical instrument">medical instrumentation</a> systems such as the <a href="/wiki/Electroencephalograph" class="mw-redirect" title="Electroencephalograph">electroencephalograph</a> (EEG) and the <a href="/wiki/Electrocardiograph" class="mw-redirect" title="Electrocardiograph">electrocardiograph</a> (ECG), in a wide variety of scientific and engineering instruments and also in reference to radio and radar receivers. Compact <a href="/wiki/Solar_cells" class="mw-redirect" title="Solar cells">solar cells</a> for devices such as <a href="/wiki/Solar-powered_calculator" title="Solar-powered calculator">calculators</a> and <a href="/wiki/Solar-powered_watch" title="Solar-powered watch">watches</a> are typically measured in microwatts.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></dd> <dt><span id="Milliwatt">Milliwatt</span></dt> <dd>A typical <a href="/wiki/Laser_pointer" title="Laser pointer">laser pointer</a> outputs about five milliwatts of light power, whereas a typical <a href="/wiki/Hearing_aid" title="Hearing aid">hearing aid</a> uses less than one milliwatt.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Audio_signal" title="Audio signal">Audio signals</a> and other electronic signal levels are often measured in <a href="/wiki/DBm" title="DBm">dBm</a>, referenced to one milliwatt.</dd> <dt><span id="Kilowatt">Kilowatt</span></dt></dl> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">"Kilowatt" and "Kilowatts" redirect here. For the musician James Watts, see <a href="/wiki/KiloWatts_(musician)" title="KiloWatts (musician)">KiloWatts (musician)</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">"kW" redirects here. For other uses, see <a href="/wiki/KW_(disambiguation)" class="mw-redirect mw-disambig" title="KW (disambiguation)">kW (disambiguation)</a>.</div> <dl><dd>The kilowatt is typically used to express the output power of <a href="/wiki/Engine" title="Engine">engines</a> and the power of <a href="/wiki/Electric_motor" title="Electric motor">electric motors</a>, tools, machines, and heaters. It is also a common unit used to express the <a href="/wiki/Electromagnetic_radiation" title="Electromagnetic radiation">electromagnetic</a> power output of broadcast radio and television <a href="/wiki/Transmitter" title="Transmitter">transmitters</a>. <div class="paragraphbreak" style="margin-top:0.5em"></div> One kilowatt is approximately equal to 1.34 <a href="/wiki/Horsepower" title="Horsepower">horsepower</a>. A small electric heater with one <a href="/wiki/Heating_element" title="Heating element">heating element</a> can use 1 kilowatt. The average <a href="/wiki/Electric_power_consumption" class="mw-redirect" title="Electric power consumption">electric power consumption</a> of a household in the United States is about 1 kilowatt.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>ii<span class="cite-bracket">]</span></a></sup> <div class="paragraphbreak" style="margin-top:0.5em"></div> A surface area of 1 square meter on Earth receives typically about one kilowatt of sunlight from the Sun (the <a href="/wiki/Solar_irradiance" title="Solar irradiance">solar irradiance</a>) (on a clear day at midday, close to the equator).<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup></dd> <dt><span id="Megawatt">Megawatt</span></dt> <dd>Many events or machines produce or sustain the conversion of energy on this scale, including large electric motors; large warships such as aircraft carriers, cruisers, and submarines; large <a href="/wiki/Server_farm" title="Server farm">server farms</a> or <a href="/wiki/Data_center#Energy_use" title="Data center">data centers</a>; and some scientific research equipment, such as <a href="/wiki/Supercollider" class="mw-redirect" title="Supercollider">supercolliders</a>, and the output pulses of very large lasers. A large residential or commercial building may use several megawatts in electric power and heat. On railways, modern high-powered <a href="/wiki/Electric_locomotive" title="Electric locomotive">electric locomotives</a> typically have a peak power output of <span class="nowrap"><span data-sort-value="7006500000000000000♠"></span>5 or 6 MW</span>, while some produce much more. The <a href="/wiki/Eurostar_e300" class="mw-redirect" title="Eurostar e300">Eurostar e300</a>, for example, uses more than <span class="nowrap"><span data-sort-value="7007120000000000000♠"></span>12 MW</span>, while heavy <a href="/wiki/Diesel_electric_locomotive" class="mw-redirect" title="Diesel electric locomotive">diesel-electric locomotives</a> typically produce and use <span class="nowrap"><span data-sort-value="7006300000000000000♠"></span>3 and 5 MW</span>. U.S. <a href="/wiki/Nuclear_power_plant" title="Nuclear power plant">nuclear power plants</a> have net summer capacities between about <span class="nowrap"><span data-sort-value="7008500000000000000♠"></span>500 and 1300 MW</span>.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Pages: 84–101">: 84–101 </span></sup> <div class="paragraphbreak" style="margin-top:0.5em"></div> The earliest citing of the megawatt in the <i><a href="/wiki/Oxford_English_Dictionary" title="Oxford English Dictionary">Oxford English Dictionary</a></i> (<i>OED</i>) is a reference in the 1900 <a href="/wiki/Webster%27s_Dictionary" title="Webster's Dictionary"><i>Webster's International Dictionary of the English Language</i></a>. The <i>OED</i> also states that <i>megawatt</i> appeared in a November 28, 1947, article in the journal <i><a href="/wiki/Science_(journal)" title="Science (journal)">Science</a></i> (506:2).</dd></dl> <figure class="mw-default-size" typeof="mw:File/Thumb"><span><video id="mwe_player_0" poster="//upload.wikimedia.org/wikipedia/commons/thumb/9/90/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv/220px--Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv.jpg" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="220" height="124" data-durationhint="37" data-mwtitle="Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv" data-mwprovider="wikimediacommons" resource="/wiki/File:Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/9/90/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv.480p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="480p.vp9.webm" data-width="854" data-height="480" /><source src="//upload.wikimedia.org/wikipedia/commons/9/90/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv" type="video/ogg; codecs="theora, vorbis"" data-width="1280" data-height="720" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/9/90/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv.240p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="240p.vp9.webm" data-width="426" data-height="240" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/9/90/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv.360p.vp9.webm" type="video/webm; codecs="vp9, opus"" data-transcodekey="360p.vp9.webm" data-width="640" data-height="360" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/9/90/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv/Office_of_Nuclear_Energy_video_explaining_gigawatts.ogv.360p.webm" type="video/webm; codecs="vp8, vorbis"" data-transcodekey="360p.webm" data-width="640" data-height="360" /></video></span><figcaption>A <a href="/wiki/United_States_Department_of_Energy" title="United States Department of Energy">United States Department of Energy</a> video explaining gigawatts</figcaption></figure> <dl><dt><span id="Gigawatt">Gigawatt</span></dt> <dd>A gigawatt is typical average power for an industrial city of one million habitants and also the output of a large power station. The GW unit is thus used for large power plants and <a href="/wiki/Power_grid" class="mw-redirect" title="Power grid">power grids</a>. For example, by the end of 2010, power shortages in China's Shanxi province were expected to increase to 5–6 GW<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> and the installation capacity of wind power in Germany was 25.8 GW.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> The largest unit (out of four) of the Belgian <a href="/wiki/Doel_Nuclear_Power_Station" title="Doel Nuclear Power Station">Doel Nuclear Power Station</a> has a peak output of 1.04 GW.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> <a href="/wiki/HVDC_converter" title="HVDC converter">HVDC converters</a> have been built with power ratings of up to 2 GW.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup></dd> <dt><span id="Terawatt">Terawatt</span></dt> <dd>The <a href="/wiki/Primary_energy" title="Primary energy">primary energy</a> used by humans worldwide was about 160,000 terawatt-hours in 2019, corresponding to an average continuous power consumption of 18 TW that year.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Earth%27s_internal_heat_budget" title="Earth's internal heat budget">Earth</a> itself emits 47±2 TW,<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> far less than the energy received from solar radiation. The most powerful lasers from the mid-1960s to the mid-1990s produced power in terawatts, but only for <a href="/wiki/Nanosecond" title="Nanosecond">nanosecond</a> intervals. The average lightning strike peaks at 1 TW, but these strikes only last for 30 <a href="/wiki/Microsecond" title="Microsecond">microseconds</a>.</dd> <dt><span id="Petawatt">Petawatt</span></dt> <dd><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/List_of_petawatt_lasers" title="List of petawatt lasers">List of petawatt lasers</a></div> A petawatt can be produced by the current generation of lasers for time scales on the order of picoseconds. One such laser is <a href="/wiki/Lawrence_Livermore_National_Laboratory" title="Lawrence Livermore National Laboratory">Lawrence Livermore</a>'s <a href="/wiki/Nova_laser" class="mw-redirect" title="Nova laser">Nova laser</a>, which achieved a power output of 1.25 PW by a process called <a href="/wiki/Chirped_pulse_amplification" title="Chirped pulse amplification">chirped pulse amplification</a>. The duration of the pulse was roughly 0.5 <a href="/wiki/Picosecond" title="Picosecond">ps</a>, giving a total energy of 600 J.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Another example is the Laser for Fast Ignition Experiments (LFEX) at the Institute of Laser Engineering (ILE), <a href="/wiki/Osaka_University" title="Osaka University">Osaka University</a>, which achieved a power output of 2 PW for a duration of approximately 1 <a href="/wiki/Picosecond" title="Picosecond">ps</a>.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> <div class="paragraphbreak" style="margin-top:0.5em"></div> Based on the average total solar irradiance of 1.361 kW/m<sup>2</sup>,<sup id="cite_ref-TSI_30-0" class="reference"><a href="#cite_note-TSI-30"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> the total power of sunlight striking Earth's atmosphere is estimated at 174 PW. The planet's average rate of global warming, measured as <a href="/wiki/Earth%27s_energy_budget#Earth's_energy_imbalance_(EEI)" title="Earth's energy budget">Earth's energy imbalance</a>, reached about 0.5 PW (0.3% of incident solar power) by 2019.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup></dd> <dt><span id="Yottawatt">Yottawatt</span></dt> <dd>The power output of the Sun is 382.8 YW, about 2 billion times the power estimated to reach Earth's atmosphere.<sup id="cite_ref-Sun_Fact_Sheet_32-0" class="reference"><a href="#cite_note-Sun_Fact_Sheet-32"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup></dd></dl> <div class="mw-heading mw-heading2"><h2 id="Conventions_in_the_electric_power_industry"><span class="anchor" id="MWe"></span><span class="anchor" id="MWt"></span><span class="anchor" id="MWm"></span><span class="anchor" id="Conventions_in_the_electric_power_industry"></span>Conventions in the electric power industry</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=5" title="Edit section: Conventions in the electric power industry"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In the <a href="/wiki/Electric_power_industry" title="Electric power industry">electric power industry</a>, <i>megawatt electrical</i> (<i>MWe</i><sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> or MW<sub>e</sub>)<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> refers by convention to the <a href="/wiki/Electric_power" title="Electric power">electric power</a> produced by a generator, while <i>megawatt thermal</i> or <i>thermal megawatt</i><sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> (MWt, MW<sub>t</sub>, or MWth, MW<sub>th</sub>) refers to <a href="/wiki/Thermal_power" class="mw-redirect" title="Thermal power">thermal power</a> produced by the plant. For example, the <a href="/wiki/Embalse_nuclear_power_plant" class="mw-redirect" title="Embalse nuclear power plant">Embalse nuclear power plant</a> in Argentina uses a <a href="/wiki/Fission_reactor" class="mw-redirect" title="Fission reactor">fission reactor</a> to generate 2,109 MW<sub>t</sub> (i.e. heat), which creates steam to drive a turbine, which generates 648 MW<sub>e</sub> (i.e. electricity). Other <a href="/wiki/SI_prefix" class="mw-redirect" title="SI prefix">SI prefixes</a> are sometimes used, for example <i>gigawatt electrical</i> (GW<sub>e</sub>). The <a href="/wiki/International_Bureau_of_Weights_and_Measures" title="International Bureau of Weights and Measures">International Bureau of Weights and Measures</a>, which maintains the SI-standard, states that further information about a quantity should not be attached to the unit symbol but instead to the quantity symbol (e.g., <span class="nowrap"><i>P</i><sub>th</sub> = 270 W</span> rather than <span class="nowrap"><i>P</i> = 270 W<sub>th</sub></span>) and so these unit symbols are non-SI.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> In compliance with SI, the energy company <a href="/wiki/%C3%98rsted_(company)" title="Ørsted (company)">Ørsted A/S</a> uses the unit megawatt for produced electrical power and the equivalent unit <a href="/wiki/Megajoule" class="mw-redirect" title="Megajoule">megajoule</a> per second for delivered heating power in a <a href="/wiki/Combined_heat_and_power" class="mw-redirect" title="Combined heat and power">combined heat and power</a> station such as <a href="/wiki/Aved%C3%B8re_Power_Station" title="Avedøre Power Station">Avedøre Power Station</a>.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p><p>When describing <a href="/wiki/Alternating_current" title="Alternating current">alternating current</a> (AC) electricity, another distinction is made between the watt and the <a href="/wiki/Volt-ampere" title="Volt-ampere">volt-ampere</a>. While these units are equivalent for simple <a href="/wiki/Resistor" title="Resistor">resistive</a> <a href="/wiki/Electrical_network" title="Electrical network">circuits</a>, they differ when loads exhibit <a href="/wiki/Electrical_reactance" title="Electrical reactance">electrical reactance</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Radio_transmission">Radio transmission</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=6" title="Edit section: Radio transmission"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Effective_radiated_power" title="Effective radiated power">Effective radiated power</a></div> <p><a href="/wiki/Radio_stations" class="mw-redirect" title="Radio stations">Radio stations</a> usually report the power of their <a href="/wiki/Transmitter" title="Transmitter">transmitters</a> in units of watts, referring to the <a href="/wiki/Effective_radiated_power" title="Effective radiated power">effective radiated power</a>. This refers to the power that a <a href="/wiki/Half-wave_antenna" class="mw-redirect" title="Half-wave antenna">half-wave</a> <a href="/wiki/Dipole_antenna" title="Dipole antenna">dipole antenna</a> would need to radiate to match the intensity of the transmitter's <a href="/wiki/Main_lobe" title="Main lobe">main lobe</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Distinction_between_watts_and_watt-hours">Distinction between watts and watt-hours</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=7" title="Edit section: Distinction between watts and watt-hours"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The terms <a href="/wiki/Power_(physics)" title="Power (physics)">power</a> and <a href="/wiki/Energy" title="Energy">energy</a> are closely related but distinct physical quantities. Power is the rate at which energy is generated or consumed and hence is measured in units (e.g. watts) that represent energy <em>per unit time</em>. </p><p>For example, when a <a href="/wiki/Light_bulb" class="mw-redirect" title="Light bulb">light bulb</a> with a <a href="/wiki/Power_rating" title="Power rating">power rating</a> of <span style="white-space:nowrap">100<span style="margin-left:0.25em">W</span></span> is turned on for one hour, the energy used is 100 <a href="/wiki/Watt_hour" class="mw-redirect" title="Watt hour">watt hours</a> (W·h), 0.1 kilowatt hour, or 360 <a href="/wiki/Joule#Kilojoule" title="Joule">kJ</a>. This same amount of energy would light a 40-watt bulb for 2.5 hours, or a 50-watt bulb for 2 hours. </p><p><a href="/wiki/Power_station" title="Power station">Power stations</a> are rated using units of power, typically megawatts or gigawatts (for example, the <a href="/wiki/Three_Gorges_Dam" title="Three Gorges Dam">Three Gorges Dam</a> in China is rated at approximately 22 gigawatts). This reflects the maximum power output it can achieve at any point in time. A power station's annual energy output, however, would be recorded using units of energy (not power), typically gigawatt hours. Major energy production or consumption is often expressed as <a href="/wiki/Terawatt_hour" class="mw-redirect" title="Terawatt hour">terawatt hours</a> for a given period; often a calendar year or financial year. One terawatt hour of energy is equal to a sustained power delivery of one terawatt for one hour, or approximately 114 megawatts for a period of one year: </p> <dl><dd>Power output = energy / time</dd></dl> <dl><dd>1 terawatt hour per year = <span class="nowrap"><span data-sort-value="7012100000000000000♠"></span>1<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>12</sup> W·h</span> / (365 days × 24 hours per day) ≈ 114 million watts,</dd></dl> <p>equivalent to approximately 114 megawatts of constant power output. </p><p>The <a href="/wiki/Watt-second" class="mw-redirect" title="Watt-second">watt-second</a> is a unit of energy, equal to the <a href="/wiki/Joule" title="Joule">joule</a>. One kilowatt hour is 3,600,000 watt seconds. </p><p>While a watt per hour is a unit of rate of change of power with time,<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>iii<span class="cite-bracket">]</span></a></sup> it is not correct to refer to a watt (or watt-hour) as a watt per hour.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=8" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output 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factor</a></li> <li><a href="/wiki/Solar_constant" title="Solar constant">Solar constant</a></li> <li><a href="/wiki/Conversion_of_units#Power_or_heat_flow_rate" title="Conversion of units">Wattage conversion factors</a></li> <li><a href="/wiki/Wattmeter" title="Wattmeter">Wattmeter</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Explanatory_notes">Explanatory notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=9" title="Edit section: Explanatory notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-lower-roman"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text">The energy in climbing the stairs is given by <span class="texhtml mvar" style="font-style:italic;">mgh</span>. Setting <span class="texhtml"><i>m</i> = 100 kg</span>, <span class="texhtml"><i>g</i> = 9.8 m/s<sup>2</sup></span> and <span class="texhtml"><i>h</i> = 3 m</span> gives 2940 J. Dividing this by the time taken (5 s) gives a power of 588 W.</span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text">Average household electric power consumption is 1.19 kW in the US, 0.53 kW in the UK. In India it is 0.13 kW (urban) and 0.03 kW (rural) – computed from GJ figures quoted by Nakagami, Murakoshi and Iwafune.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup></span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><b><a href="#cite_ref-38">^</a></b></span> <span class="reference-text">Watts per hour refers to the <em>rate of change</em> of power being used (or generated). For example, a power plant that changes its power output from 100 MW to 200 MW in 15 minutes would have a ramp-up rate of 400 MW/h. Gigawatts per hour are used to characterize the ramp-up required of the <a href="/wiki/Power_plant" class="mw-redirect" title="Power plant">power plants</a> on an electric grid to compensate for loss of output from other sources, such as when <a href="/wiki/Solar_power" title="Solar power">solar power</a> generation drops to zero as the sun sets. See <a href="/wiki/Duck_curve" title="Duck curve">duck curve</a>.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Watt&action=edit&section=10" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFNewellTiesinga2019" class="citation report cs1">Newell, David B; Tiesinga, Eite (2019). <a rel="nofollow" class="external text" href="https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.330-2019.pdf">The international system of units (SI)</a> <span class="cs1-format">(PDF)</span> (Report). Gaithersburg, MD: National Institute of Standards and Technology. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.6028%2Fnist.sp.330-2019">10.6028/nist.sp.330-2019</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=report&rft.btitle=The+international+system+of+units+%28SI%29&rft.place=Gaithersburg%2C+MD&rft.pub=National+Institute+of+Standards+and+Technology&rft.date=2019&rft_id=info%3Adoi%2F10.6028%2Fnist.sp.330-2019&rft.aulast=Newell&rft.aufirst=David+B&rft.au=Tiesinga%2C+Eite&rft_id=https%3A%2F%2Fnvlpubs.nist.gov%2Fnistpubs%2FSpecialPublications%2FNIST.SP.330-2019.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span> §2.3.4, Table 4.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFYildizLiu2018" class="citation book cs1">Yildiz, I.; Liu, Y. (2018). "Energy units, conversions, and dimensional analysis". In Dincer, I. (ed.). <i>Comprehensive energy systems. Vol 1: Energy fundamentals</i>. Elsevier. pp. 12–13. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780128149256" title="Special:BookSources/9780128149256"><bdi>9780128149256</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Energy+units%2C+conversions%2C+and+dimensional+analysis&rft.btitle=Comprehensive+energy+systems.+Vol+1%3A+Energy+fundamentals&rft.pages=12-13&rft.pub=Elsevier&rft.date=2018&rft.isbn=9780128149256&rft.aulast=Yildiz&rft.aufirst=I.&rft.au=Liu%2C+Y.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFInternational_Bureau_of_Weights_and_Measures2006" class="citation cs2"><a href="/wiki/International_Bureau_of_Weights_and_Measures" title="International Bureau of Weights and Measures">International Bureau of Weights and Measures</a> (2006), <a rel="nofollow" class="external text" href="https://www.bipm.org/documents/20126/41483022/si_brochure_8.pdf"><i>The International System of Units (SI)</i></a> <span class="cs1-format">(PDF)</span> (8th ed.), pp. 118, 144, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/92-822-2213-6" title="Special:BookSources/92-822-2213-6"><bdi>92-822-2213-6</bdi></a>, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210604163219/https://www.bipm.org/documents/20126/41483022/si_brochure_8.pdf">archived</a> <span class="cs1-format">(PDF)</span> from the original on June 4, 2021<span class="reference-accessdate">, retrieved <span class="nowrap">December 16,</span> 2021</span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+International+System+of+Units+%28SI%29&rft.pages=118%2C+144&rft.edition=8th&rft.date=2006&rft.isbn=92-822-2213-6&rft.au=International+Bureau+of+Weights+and+Measures&rft_id=https%3A%2F%2Fwww.bipm.org%2Fdocuments%2F20126%2F41483022%2Fsi_brochure_8.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAvallone2007" class="citation cs2">Avallone, Eugene A; et al., eds. (2007), <i>Marks' Standard Handbook for Mechanical Engineers</i> (11th ed.), New York: Mc-Graw Hill, pp. 9–4, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-07-142867-5" title="Special:BookSources/978-0-07-142867-5"><bdi>978-0-07-142867-5</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Marks%27+Standard+Handbook+for+Mechanical+Engineers&rft.place=New+York&rft.pages=9-4&rft.edition=11th&rft.pub=Mc-Graw+Hill&rft.date=2007&rft.isbn=978-0-07-142867-5&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span>.</span> </li> <li id="cite_note-Klein-6"><span class="mw-cite-backlink">^ <a href="#cite_ref-Klein_6-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Klein_6-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Klein_6-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKlein1988" class="citation book cs1">Klein, Herbert Arthur (1988) [1974]. <i>The Science of measurement: A historical survey</i>. New York: Dover. p. 239. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780486144979" title="Special:BookSources/9780486144979"><bdi>9780486144979</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Science+of+measurement%3A+A+historical+survey&rft.place=New+York&rft.pages=239&rft.pub=Dover&rft.date=1988&rft.isbn=9780486144979&rft.aulast=Klein&rft.aufirst=Herbert+Arthur&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></span> </li> <li id="cite_note-Siemens-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-Siemens_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation encyclopaedia cs1"><a rel="nofollow" class="external text" href="https://www.biodiversitylibrary.org/item/95237#page/85/mode/1up">"Address by C. William Siemens"</a>. <i>Report of the Fifty-Second meeting of the British Association for the Advancement of Science</i>. Vol. 52. London: John Murray. 1883. pp. 1–33.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Address+by+C.+William+Siemens&rft.btitle=Report+of+the+Fifty-Second+meeting+of+the+British+Association+for+the+Advancement+of+Science&rft.place=London&rft.pages=1-33&rft.pub=John+Murray&rft.date=1883&rft_id=https%3A%2F%2Fwww.biodiversitylibrary.org%2Fitem%2F95237%23page%2F85%2Fmode%2F1up&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">Siemens supported his proposal by asserting that Watt was the first who "had a clear physical conception of power, and gave a rational method for measuring it". <a rel="nofollow" class="external text" href="https://www.biodiversitylibrary.org/item/95237#page/90/mode/1up">"Siemens, 1883, p. 6"</a></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1 cs1-prop-long-vol"><a rel="nofollow" class="external text" href="https://www.biodiversitylibrary.org/item/95237"><i>Report of the British Association for the Advancement of Science</i></a>. Vol. 52nd Meeting (1882). April 3, 1883.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Report+of+the+British+Association+for+the+Advancement+of+Science&rft.date=1883-04-03&rft_id=https%3A%2F%2Fwww.biodiversitylibrary.org%2Fitem%2F95237&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTunbridge,_P.1992" class="citation book cs1">Tunbridge, P. (1992). <i>Lord Kelvin: His Influence on Electrical Measurements and Units</i>. Peter Peregrinus: London. p. 51. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-86341-237-8" title="Special:BookSources/0-86341-237-8"><bdi>0-86341-237-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Lord+Kelvin%3A+His+Influence+on+Electrical+Measurements+and+Units&rft.place=Peter+Peregrinus&rft.pages=51&rft.pub=London&rft.date=1992&rft.isbn=0-86341-237-8&rft.au=Tunbridge%2C+P.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></span> </li> <li id="cite_note-EB11-742-11"><span class="mw-cite-backlink">^ <a href="#cite_ref-EB11-742_11-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-EB11-742_11-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFleming1911" class="citation encyclopaedia cs1"><a href="/wiki/John_Ambrose_Fleming" title="John Ambrose Fleming">Fleming, John Ambrose</a> (1911). <span class="cs1-ws-icon" title="s:1911 Encyclopædia Britannica/Units, Physical"><a class="external text" href="https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Units,_Physical">"Units, Physical" </a></span>. 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ATI courses.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+International+System+of+Units%3A+Its+History+and+Use+in+Science+and+Industry&rft.series=Via+Satellite&rft.pub=ATI+courses&rft.date=2000-02&rft.aulast=Nelson&rft.aufirst=Robert+A.&rft_id=http%3A%2F%2Fwww.aticourses.com%2Finternational_system_units.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AWatt" class="Z3988"></span></li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output 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.navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="SI_units" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:SI_units" title="Template:SI units"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:SI_units" title="Template talk:SI units"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:SI_units" title="Special:EditPage/Template:SI units"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="SI_units" style="font-size:114%;margin:0 4em"><a href="/wiki/International_System_of_Units" title="International System of Units">SI units</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/SI_base_unit" title="SI base unit">Base units</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ampere" title="Ampere">ampere</a></li> <li><a href="/wiki/Candela" title="Candela">candela</a></li> <li><a href="/wiki/Kelvin" title="Kelvin">kelvin</a></li> <li><a href="/wiki/Kilogram" title="Kilogram">kilogram</a></li> <li><a href="/wiki/Metre" title="Metre">metre</a></li> <li><a href="/wiki/Mole_(unit)" title="Mole (unit)">mole</a></li> <li><a href="/wiki/Second" title="Second">second</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/SI_derived_unit" title="SI derived unit">Derived units <br />with special names</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Becquerel" title="Becquerel">becquerel</a></li> <li><a href="/wiki/Coulomb" title="Coulomb">coulomb</a></li> <li><a href="/wiki/Celsius" title="Celsius">degree Celsius</a></li> <li><a href="/wiki/Farad" title="Farad">farad</a></li> <li><a href="/wiki/Gray_(unit)" title="Gray (unit)">gray</a></li> <li><a href="/wiki/Henry_(unit)" title="Henry (unit)">henry</a></li> <li><a href="/wiki/Hertz" title="Hertz">hertz</a></li> <li><a href="/wiki/Joule" title="Joule">joule</a></li> <li><a href="/wiki/Katal" title="Katal">katal</a></li> <li><a href="/wiki/Lumen_(unit)" title="Lumen (unit)">lumen</a></li> <li><a href="/wiki/Lux" title="Lux">lux</a></li> <li><a href="/wiki/Newton_(unit)" title="Newton (unit)">newton</a></li> <li><a href="/wiki/Ohm" title="Ohm">ohm</a></li> <li><a href="/wiki/Pascal_(unit)" title="Pascal (unit)">pascal</a></li> <li><a href="/wiki/Radian" title="Radian">radian</a></li> <li><a href="/wiki/Siemens_(unit)" title="Siemens (unit)">siemens</a></li> <li><a href="/wiki/Sievert" title="Sievert">sievert</a></li> <li><a href="/wiki/Steradian" title="Steradian">steradian</a></li> <li><a href="/wiki/Tesla_(unit)" title="Tesla (unit)">tesla</a></li> <li><a href="/wiki/Volt" title="Volt">volt</a></li> <li><a class="mw-selflink selflink">watt</a></li> <li><a href="/wiki/Weber_(unit)" title="Weber (unit)">weber</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Non-SI_units_mentioned_in_the_SI" title="Non-SI units mentioned in the SI">Other accepted units</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astronomical_unit" title="Astronomical unit">astronomical unit</a></li> <li><a href="/wiki/Dalton_(unit)" title="Dalton (unit)">dalton</a></li> <li><a href="/wiki/Day" title="Day">day</a></li> <li><a href="/wiki/Decibel" title="Decibel">decibel</a></li> <li><a href="/wiki/Degree_(angle)" title="Degree (angle)">degree of arc</a></li> <li><a href="/wiki/Electronvolt" title="Electronvolt">electronvolt</a></li> <li><a href="/wiki/Hectare" title="Hectare">hectare</a></li> <li><a href="/wiki/Hour" title="Hour">hour</a></li> <li><a href="/wiki/Litre" title="Litre">litre</a></li> <li><a href="/wiki/Minute" title="Minute">minute</a></li> <li><a href="/wiki/Minute_and_second_of_arc" title="Minute and second of arc">minute and second of arc</a></li> <li><a href="/wiki/Neper" title="Neper">neper</a></li> <li><a href="/wiki/Tonne" title="Tonne">tonne</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">See also</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Conversion_of_units" title="Conversion of units">Conversion of units</a></li> <li><a href="/wiki/Metric_prefix" title="Metric prefix">Metric prefixes</a></li> <li><a href="/wiki/Historical_definitions_of_the_SI_base_units" title="Historical definitions of the SI base units">Historical definitions of the SI base units</a></li> <li><a href="/wiki/2019_revision_of_the_SI" title="2019 revision of the SI">2019 revision of the SI</a></li> <li><a href="/wiki/System_of_units_of_measurement" title="System of units of measurement">System of units of measurement</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:SI_units" title="Category:SI units">Category</a></li></ul> </div></td></tr></tbody></table></div>    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