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indirizzo IP [n]" accesskey="n"><span>discussioni</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Sito"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Indice" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Indice</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">nascondi</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inizio</div> </a> </li> <li id="toc-Definizione" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Definizione"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Definizione</span> </div> </a> <ul id="toc-Definizione-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Dipendenza_dalla_temperatura" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Dipendenza_dalla_temperatura"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Dipendenza dalla temperatura</span> </div> </a> <button aria-controls="toc-Dipendenza_dalla_temperatura-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Attiva/disattiva la sottosezione Dipendenza dalla temperatura</span> </button> <ul id="toc-Dipendenza_dalla_temperatura-sublist" class="vector-toc-list"> <li id="toc-Nei_metalli" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nei_metalli"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Nei metalli</span> </div> </a> <ul id="toc-Nei_metalli-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Nei_semiconduttori" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nei_semiconduttori"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Nei semiconduttori</span> </div> </a> <ul id="toc-Nei_semiconduttori-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Nei_dielettrici" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nei_dielettrici"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Nei dielettrici</span> </div> </a> <ul id="toc-Nei_dielettrici-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Nei_superconduttori" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Nei_superconduttori"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Nei superconduttori</span> </div> </a> <ul id="toc-Nei_superconduttori-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Resistività_comuni" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Resistività_comuni"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Resistività comuni</span> </div> </a> <ul id="toc-Resistività_comuni-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Unità_di_misura" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Unità_di_misura"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Unità di misura</span> </div> </a> <ul id="toc-Unità_di_misura-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Note" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Note"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Note</span> </div> </a> <ul id="toc-Note-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliografia" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bibliografia"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Bibliografia</span> </div> </a> <ul id="toc-Bibliografia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Voci_correlate" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voci_correlate"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Voci correlate</span> </div> </a> <ul id="toc-Voci_correlate-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Altri_progetti" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Altri_progetti"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Altri progetti</span> </div> </a> <ul id="toc-Altri_progetti-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Collegamenti_esterni" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Collegamenti_esterni"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Collegamenti esterni</span> </div> </a> <ul id="toc-Collegamenti_esterni-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="Indice" 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="Mostra/Nascondi l'indice" > <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">Mostra/Nascondi l'indice</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">Resistività elettrica</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="Vai a una voce in un'altra lingua. Disponibile in 55 lingue" > <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-55" 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">55 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Elektriese_resistiwiteit" title="Elektriese resistiwiteit - afrikaans" lang="af" hreflang="af" data-title="Elektriese resistiwiteit" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D9%82%D8%A7%D9%88%D9%85%D9%8A%D8%A9" title="مقاومية - arabo" lang="ar" hreflang="ar" data-title="مقاومية" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Resistivid%C3%A1" title="Resistividá - asturiano" lang="ast" hreflang="ast" data-title="Resistividá" data-language-autonym="Asturianu" data-language-local-name="asturiano" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A3%D0%B4%D0%B7%D0%B5%D0%BB%D1%8C%D0%BD%D0%B0%D0%B5_%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D1%8B%D1%87%D0%BD%D0%B0%D0%B5_%D1%81%D1%83%D0%BF%D1%80%D0%B0%D1%86%D1%96%D1%9E%D0%BB%D0%B5%D0%BD%D0%BD%D0%B5" title="Удзельнае электрычнае супраціўленне - bielorusso" lang="be" hreflang="be" data-title="Удзельнае электрычнае супраціўленне" data-language-autonym="Беларуская" data-language-local-name="bielorusso" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%84%D0%B8%D1%87%D0%BD%D0%BE_%D0%B5%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE_%D1%81%D1%8A%D0%BF%D1%80%D0%BE%D1%82%D0%B8%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5" title="Специфично електрическо съпротивление - bulgaro" lang="bg" hreflang="bg" data-title="Специфично електрическо съпротивление" data-language-autonym="Български" data-language-local-name="bulgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Resistivitat" title="Resistivitat - catalano" lang="ca" hreflang="ca" data-title="Resistivitat" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Rezistivita" title="Rezistivita - ceco" lang="cs" hreflang="cs" data-title="Rezistivita" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%9F%D0%B0%D0%B9%D0%BB%D0%B0%D0%B2%D0%BB%D0%B0_%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE_%D1%85%D0%B8%D1%80%C4%95%C3%A7%D1%82%C4%83%D1%80%D1%83" title="Пайлавла электро хирĕçтăру - ciuvascio" lang="cv" hreflang="cv" data-title="Пайлавла электро хирĕçтăру" data-language-autonym="Чӑвашла" data-language-local-name="ciuvascio" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Gwrthedd" title="Gwrthedd - gallese" lang="cy" hreflang="cy" data-title="Gwrthedd" data-language-autonym="Cymraeg" data-language-local-name="gallese" 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/Elektrisk_resistivitet" title="Elektrisk resistivitet - danese" lang="da" hreflang="da" data-title="Elektrisk resistivitet" data-language-autonym="Dansk" data-language-local-name="danese" 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/Spezifischer_Widerstand" title="Spezifischer Widerstand - tedesco" lang="de" hreflang="de" data-title="Spezifischer Widerstand" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CE%AE_%CE%B7%CE%BB%CE%B5%CE%BA%CF%84%CF%81%CE%B9%CE%BA%CE%AE_%CE%B1%CE%BD%CF%84%CE%AF%CF%83%CF%84%CE%B1%CF%83%CE%B7" title="Ειδική ηλεκτρική αντίσταση - greco" lang="el" hreflang="el" data-title="Ειδική ηλεκτρική αντίσταση" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en badge-Q70893996 mw-list-item" title=""><a href="https://en.wikipedia.org/wiki/Electrical_resistivity" title="Electrical resistivity - inglese" lang="en" hreflang="en" data-title="Electrical resistivity" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Elektra_rezistivo" title="Elektra rezistivo - esperanto" lang="eo" hreflang="eo" data-title="Elektra rezistivo" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Resistividad" title="Resistividad - spagnolo" lang="es" hreflang="es" data-title="Resistividad" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Eritakistus" title="Eritakistus - estone" lang="et" hreflang="et" data-title="Eritakistus" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Erresistibitate_elektriko" title="Erresistibitate elektriko - basco" lang="eu" hreflang="eu" data-title="Erresistibitate elektriko" data-language-autonym="Euskara" data-language-local-name="basco" 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%85%D9%82%D8%A7%D9%88%D9%85%D8%AA%E2%80%8C%D9%88%DB%8C%DA%98%D9%87_%D9%88_%D8%B1%D8%B3%D8%A7%D9%86%D9%86%D8%AF%DA%AF%DB%8C_%D8%A7%D9%84%DA%A9%D8%AA%D8%B1%DB%8C%DA%A9%DB%8C" title="مقاومت‌ویژه و رسانندگی الکتریکی - persiano" lang="fa" hreflang="fa" data-title="مقاومت‌ویژه و رسانندگی الکتریکی" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Resistiivisyys" title="Resistiivisyys - finlandese" lang="fi" hreflang="fi" data-title="Resistiivisyys" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/R%C3%A9sistivit%C3%A9" title="Résistivité - francese" lang="fr" hreflang="fr" data-title="Résistivité" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Friotachas" title="Friotachas - irlandese" lang="ga" hreflang="ga" data-title="Friotachas" data-language-autonym="Gaeilge" data-language-local-name="irlandese" 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/Resistividade" title="Resistividade - galiziano" lang="gl" hreflang="gl" data-title="Resistividade" data-language-autonym="Galego" data-language-local-name="galiziano" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he badge-Q70893996 mw-list-item" title=""><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%A7%D7%93%D7%9D_%D7%94%D7%AA%D7%A0%D7%92%D7%93%D7%95%D7%AA_%D7%97%D7%A9%D7%9E%D7%9C%D7%99%D7%AA" title="מקדם התנגדות חשמלית - ebraico" lang="he" hreflang="he" data-title="מקדם התנגדות חשמלית" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A4%E0%A4%BF%E0%A4%B0%E0%A5%8B%E0%A4%A7%E0%A4%95%E0%A4%A4%E0%A4%BE" title="प्रतिरोधकता - hindi" lang="hi" hreflang="hi" data-title="प्रतिरोधकता" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Fajlagos_ellen%C3%A1ll%C3%A1s" title="Fajlagos ellenállás - ungherese" lang="hu" hreflang="hu" data-title="Fajlagos ellenállás" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id badge-Q70893996 mw-list-item" title=""><a href="https://id.wikipedia.org/wiki/Resistivitas_listrik" title="Resistivitas listrik - indonesiano" lang="id" hreflang="id" data-title="Resistivitas listrik" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%9B%BB%E6%B0%97%E6%8A%B5%E6%8A%97%E7%8E%87" title="電気抵抗率 - giapponese" lang="ja" hreflang="ja" data-title="電気抵抗率" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B9%84%EC%A0%80%ED%95%AD" title="비저항 - coreano" lang="ko" hreflang="ko" data-title="비저항" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/%C4%AApatn%C4%93j%C4%81_pretest%C4%ABba" title="Īpatnējā pretestība - lettone" lang="lv" hreflang="lv" data-title="Īpatnējā pretestība" data-language-autonym="Latviešu" data-language-local-name="lettone" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%95%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0_%D0%BE%D1%82%D0%BF%D0%BE%D1%80%D0%BD%D0%BE%D1%81%D1%82" title="Електрична отпорност - macedone" lang="mk" hreflang="mk" data-title="Електрична отпорност" data-language-autonym="Македонски" data-language-local-name="macedone" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Soortelijke_weerstand" title="Soortelijke weerstand - olandese" lang="nl" hreflang="nl" data-title="Soortelijke weerstand" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Resistivitet" title="Resistivitet - norvegese nynorsk" lang="nn" hreflang="nn" data-title="Resistivitet" data-language-autonym="Norsk nynorsk" data-language-local-name="norvegese nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Resistivitet" title="Resistivitet - norvegese bokmål" lang="nb" hreflang="nb" data-title="Resistivitet" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AC%E0%A8%BF%E0%A8%9C%E0%A8%B2%E0%A8%88_%E0%A8%AA%E0%A9%8D%E0%A8%B0%E0%A8%A4%E0%A8%BF%E0%A8%B0%E0%A9%8B%E0%A8%A7%E0%A8%95%E0%A8%A4%E0%A8%BE" title="ਬਿਜਲਈ ਪ੍ਰਤਿਰੋਧਕਤਾ - punjabi" lang="pa" hreflang="pa" data-title="ਬਿਜਲਈ ਪ੍ਰਤਿਰੋਧਕਤਾ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Rezystywno%C5%9B%C4%87" title="Rezystywność - polacco" lang="pl" hreflang="pl" data-title="Rezystywność" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Arzistivit%C3%A0" title="Arzistività - piemontese" lang="pms" hreflang="pms" data-title="Arzistività" data-language-autonym="Piemontèis" data-language-local-name="piemontese" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%A8%D8%B1%D9%82%DB%8C_%D9%85%D8%B2%D8%A7%D8%AD%D9%85%D8%AA" title="برقی مزاحمت - Western Punjabi" lang="pnb" hreflang="pnb" data-title="برقی مزاحمت" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Resistividade" title="Resistividade - portoghese" lang="pt" hreflang="pt" data-title="Resistividade" data-language-autonym="Português" data-language-local-name="portoghese" 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/Rezistivitate_electric%C4%83" title="Rezistivitate electrică - rumeno" lang="ro" hreflang="ro" data-title="Rezistivitate electrică" data-language-autonym="Română" data-language-local-name="rumeno" 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%A3%D0%B4%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5_%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE%D0%B5_%D1%81%D0%BE%D0%BF%D1%80%D0%BE%D1%82%D0%B8%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D0%B5" title="Удельное электрическое сопротивление - russo" lang="ru" hreflang="ru" data-title="Удельное электрическое сопротивление" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Electrical_resistivity" title="Electrical resistivity - Simple English" lang="en-simple" hreflang="en-simple" data-title="Electrical resistivity" 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/Mern%C3%BD_elektrick%C3%BD_odpor" title="Merný elektrický odpor - slovacco" lang="sk" hreflang="sk" data-title="Merný elektrický odpor" data-language-autonym="Slovenčina" data-language-local-name="slovacco" 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/Specifi%C4%8Dna_upornost" title="Specifična upornost - sloveno" lang="sl" hreflang="sl" data-title="Specifična upornost" data-language-autonym="Slovenščina" data-language-local-name="sloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Kuperekera_magetsi" title="Kuperekera magetsi - shona" lang="sn" hreflang="sn" data-title="Kuperekera magetsi" data-language-autonym="ChiShona" data-language-local-name="shona" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-sr badge-Q70893996 mw-list-item" title=""><a href="https://sr.wikipedia.org/wiki/%D0%95%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%B8%D1%87%D0%BD%D0%B0_%D0%BE%D1%82%D0%BF%D0%BE%D1%80%D0%BD%D0%BE%D1%81%D1%82" title="Електрична отпорност - serbo" lang="sr" hreflang="sr" data-title="Електрична отпорност" data-language-autonym="Српски / srpski" data-language-local-name="serbo" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Elektrisk_resistivitet" title="Elektrisk resistivitet - svedese" lang="sv" hreflang="sv" data-title="Elektrisk resistivitet" data-language-autonym="Svenska" data-language-local-name="svedese" 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/Konduksiyong_elektrikal" title="Konduksiyong elektrikal - tagalog" lang="tl" hreflang="tl" data-title="Konduksiyong elektrikal" data-language-autonym="Tagalog" data-language-local-name="tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/%C3%96zdiren%C3%A7" title="Özdirenç - turco" lang="tr" hreflang="tr" data-title="Özdirenç" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%A7%D0%B0%D0%B3%D1%8B%D1%88%D1%82%D1%8B%D1%80%D0%BC%D0%B0_%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80_%D0%BA%D0%B0%D1%80%D1%88%D1%8B%D0%BB%D1%8B%D0%B3%D1%8B" title="Чагыштырма электр каршылыгы - tataro" lang="tt" hreflang="tt" data-title="Чагыштырма электр каршылыгы" data-language-autonym="Татарча / tatarça" data-language-local-name="tataro" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%B8%D1%82%D0%BE%D0%BC%D0%B8%D0%B9_%D0%BE%D0%BF%D1%96%D1%80" title="Питомий опір - ucraino" lang="uk" hreflang="uk" data-title="Питомий опір" data-language-autonym="Українська" data-language-local-name="ucraino" 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%85%D8%B2%D8%A7%D8%AD%D9%85%DB%8C%D8%AA" title="مزاحمیت - urdu" lang="ur" hreflang="ur" data-title="مزاحمیت" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi badge-Q70893996 mw-list-item" title=""><a href="https://vi.wikipedia.org/wiki/%C4%90i%E1%BB%87n_tr%E1%BB%9F_su%E1%BA%A5t" title="Điện trở suất - vietnamita" lang="vi" hreflang="vi" data-title="Điện trở suất" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wo mw-list-item"><a href="https://wo.wikipedia.org/wiki/D%C3%ABg%C3%ABrluwiin" title="Dëgërluwiin - wolof" lang="wo" hreflang="wo" data-title="Dëgërluwiin" data-language-autonym="Wolof" data-language-local-name="wolof" class="interlanguage-link-target"><span>Wolof</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E7%94%B5%E9%98%BB%E7%8E%87" title="电阻率 - wu" lang="wuu" hreflang="wuu" data-title="电阻率" 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 mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%94%B5%E9%98%BB%E7%8E%87" title="电阻率 - cinese" lang="zh" hreflang="zh" data-title="电阻率" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q108193#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> 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</div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Strumenti pagine"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aspetto"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aspetto</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">nascondi</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Da Wikipedia, l'enciclopedia libera.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><p>La <b>resistività elettrica</b>, anche detta <b>resistenza elettrica specifica</b> e indicata con la lettera greca "ρ", è la <a href="/wiki/Resistenza_elettrica" title="Resistenza elettrica">resistenza</a> caratteristica di un pezzo di materiale <a href="/wiki/Conduttore_elettrico" title="Conduttore elettrico">conduttore</a> avente lunghezza di 1 m e sezione di 1 m². Rappresenta perciò la resistenza di un conduttore della sostanza in esame di lunghezza e sezione unitarie, ed è un parametro che dipende dalla temperatura e dalle proprietà del <a href="/wiki/Materiale" title="Materiale">materiale</a>. Nel <a href="/wiki/Sistema_internazionale_di_unit%C3%A0_di_misura" title="Sistema internazionale di unità di misura">sistema internazionale</a> la resistività si misura in <a href="/wiki/Ohm" title="Ohm">ohm</a> per <a href="/wiki/Metro" title="Metro">metro</a> (Ω·m). I buoni conduttori hanno valori bassi di ρ, mentre i buoni <a href="/wiki/Isolante_elettrico" title="Isolante elettrico">isolanti</a> hanno valori alti di ρ. La resistività differisce dalla resistenza in quanto è una proprietà specifica della sostanza in questione; al contrario la resistenza R è una proprietà di un oggetto che dipende dalla forma, dalla dimensione e dalla resistività del materiale.<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> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Definizione">Definizione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=1" title="Modifica la sezione Definizione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=1" title="Edit section's source code: Definizione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La resistività <i>ρ</i> è definita come<sup id="cite_ref-Tur222_3-0" class="reference"><a href="#cite_note-Tur222-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>: </p> <dl><dd><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 \rho =E/j}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ρ</mi> <mo>=</mo> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>j</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \rho =E/j}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f5548a520b3ecb8d96153bcc85164eb512331ff6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:8.197ex; height:2.843ex;" alt="{\displaystyle \rho =E/j}"></span> in modulo, <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="{\textstyle {\vec {E}}=\rho {\vec {j}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="false" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mover> <mi>E</mi> <mo stretchy="false">→</mo> </mover> </mrow> </mrow> <mo>=</mo> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mover> <mi>j</mi> <mo stretchy="false">→</mo> </mover> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\textstyle {\vec {E}}=\rho {\vec {j}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7b43d6c2172373f37ac393f3431f07d71b0f4feb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:7.17ex; height:3.343ex;" alt="{\textstyle {\vec {E}}=\rho {\vec {j}}}"></span> vettorialmente</dd></dl> <p>dove <i>E</i> è il <a href="/wiki/Campo_elettrico" title="Campo elettrico">campo elettrico</a>, <i>j</i> la <a href="/wiki/Densit%C3%A0_di_corrente_elettrica" title="Densità di corrente elettrica">densità di corrente elettrica</a>, o anche </p> <dl><dd><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 \rho ={\cfrac {1}{\sigma }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ρ</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mpadded width="0" height="8.6pt" depth="3pt"> <mrow /> </mpadded> <mstyle displaystyle="false" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> </mrow> </mstyle> </mrow> <mrow> <mpadded width="0" height="8.6pt" depth="3pt"> <mrow /> </mpadded> <mstyle displaystyle="false" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mi>σ</mi> </mrow> </mstyle> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \rho ={\cfrac {1}{\sigma }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/14497d11df9e33c61504d7dc29e16e11aef6bc23" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -3.005ex; width:6.466ex; height:7.176ex;" alt="{\displaystyle \rho ={\cfrac {1}{\sigma }}}"></span></dd></dl> <p>dove è la <i>σ</i> <a href="/wiki/Conduttivit%C3%A0_elettrica" title="Conduttività elettrica">conduttività elettrica</a>, misurata in <a href="/wiki/Siemens_(unit%C3%A0_di_misura)" title="Siemens (unità di misura)">Siemens</a>. </p><p>Resistività e <a href="/wiki/Resistenza_elettrica" title="Resistenza elettrica">resistenza</a>, nel caso particolare in cui la <a href="/wiki/Corrente_continua" title="Corrente continua">corrente è continua</a> e il conduttore è un lungo cilindro (ad esempio un filo), sono legate dalla formula: </p><p><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 R=\rho {\frac {L}{A}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>R</mi> <mo>=</mo> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>L</mi> <mi>A</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle R=\rho {\frac {L}{A}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1c7385107040638318e640d99d9859ecf3dd32fa" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:8.644ex; height:5.343ex;" alt="{\displaystyle R=\rho {\frac {L}{A}}}"></span> </p><p>dove <i>R</i> è la resistenza, <i>L</i> è la lunghezza del cilindro, <i>A</i> è l'area della sezione circolare del cilindro. </p> <div class="mw-heading mw-heading2"><h2 id="Dipendenza_dalla_temperatura">Dipendenza dalla temperatura</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=2" title="Modifica la sezione Dipendenza dalla temperatura" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=2" title="Edit section's source code: Dipendenza dalla temperatura"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Nei_metalli">Nei metalli</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=3" title="Modifica la sezione Nei metalli" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=3" title="Edit section's source code: Nei metalli"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La resistività di un metallo aumenta all'aumentare della <a href="/wiki/Temperatura" title="Temperatura">temperatura</a>: </p> <dl><dd><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 \rho =\rho _{0}[1+\alpha (T-T_{0})]}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ρ</mi> <mo>=</mo> <msub> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo stretchy="false">[</mo> <mn>1</mn> <mo>+</mo> <mi>α</mi> <mo stretchy="false">(</mo> <mi>T</mi> <mo>−</mo> <msub> <mi>T</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo stretchy="false">)</mo> <mo stretchy="false">]</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \rho =\rho _{0}[1+\alpha (T-T_{0})]}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1f5b9313a5f6bbc146f9f7b00eb91e79457aa799" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:22.038ex; height:2.843ex;" alt="{\displaystyle \rho =\rho _{0}[1+\alpha (T-T_{0})]}"></span></dd></dl> <p>dove <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 \rho }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ρ</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \rho }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1f7d439671d1289b6a816e6af7a304be40608d64" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:1.202ex; height:2.176ex;" alt="{\displaystyle \rho }"></span> è la resistività e T la temperatura, mentre <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 \rho _{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>ρ</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \rho _{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d9c04a9d26b86af8c6205ba2a6287fd655b6b714" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:2.256ex; height:2.176ex;" alt="{\displaystyle \rho _{0}}"></span> è la resistività del metallo alla temperatura T<sub>0</sub> di riferimento, solitamente 20 <a href="/wiki/Celsius" class="mw-redirect" title="Celsius">°C</a>, α è il coefficiente termico dipendente dal materiale. Nella grafite e nelle sue soluzioni la resistività diminuisce all'aumentare della temperatura. Nella <a href="/wiki/Costantana" title="Costantana">costantana</a> (lega binaria di <a href="/wiki/Rame" title="Rame">Cu</a>-<a href="/wiki/Nichel" title="Nichel">Ni</a>), la resistività non varia al variare della temperatura. </p> <div class="mw-heading mw-heading3"><h3 id="Nei_semiconduttori">Nei semiconduttori</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=4" title="Modifica la sezione Nei semiconduttori" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=4" title="Edit section's source code: Nei semiconduttori"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La resistività di un <a href="/wiki/Semiconduttore" title="Semiconduttore">semiconduttore</a> diminuisce esponenzialmente con l'aumentare della temperatura. Più precisamente la relazione è data dalla <a href="/wiki/Formula_di_Steinhart-Hart" class="mw-redirect" title="Formula di Steinhart-Hart">formula di Steinhart-Hart</a>: </p> <dl><dd><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 1/T=A+B\ln R+C(\ln R)^{3}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi>T</mi> <mo>=</mo> <mi>A</mi> <mo>+</mo> <mi>B</mi> <mi>ln</mi> <mo>⁡</mo> <mi>R</mi> <mo>+</mo> <mi>C</mi> <mo stretchy="false">(</mo> <mi>ln</mi> <mo>⁡</mo> <mi>R</mi> <msup> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mn>3</mn> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle 1/T=A+B\ln R+C(\ln R)^{3}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/3b1b6e4d12818f7144a9c1ca0b959d68b56a9ec7" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:29.445ex; height:3.176ex;" alt="{\displaystyle 1/T=A+B\ln R+C(\ln R)^{3}}"></span></dd></dl> <p>dove <i>A</i>, <i>B</i> e <i>C</i> sono coefficienti specifici del materiale. </p> <div class="mw-heading mw-heading3"><h3 id="Nei_dielettrici">Nei dielettrici</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=5" title="Modifica la sezione Nei dielettrici" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=5" title="Edit section's source code: Nei dielettrici"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>La resistività di un materiale dielettrico diminuisce all'aumentare della temperatura. </p> <div class="mw-heading mw-heading3"><h3 id="Nei_superconduttori">Nei superconduttori</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=6" title="Modifica la sezione Nei superconduttori" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=6" title="Edit section's source code: Nei superconduttori"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Alcuni materiali, detti <a href="/wiki/Superconduttivit%C3%A0" title="Superconduttività">superconduttori</a>, quando vengono portati al di sotto della loro temperatura critica, assumono una resistività uguale a zero, cioè non offrono alcuna resistenza al passaggio della corrente. Al di sopra della temperatura critica, con l'aumentare della temperatura aumenta la resistività. </p> <div class="mw-heading mw-heading2"><h2 id="Resistività_comuni"><span id="Resistivit.C3.A0_comuni"></span>Resistività comuni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=7" title="Modifica la sezione Resistività comuni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=7" title="Edit section's source code: Resistività comuni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Nella seguente tabella sono riportate le resistività caratteristiche di alcuni materiali a <a href="/wiki/Condizioni_standard#Condizioni_normali" title="Condizioni standard">condizioni normali</a> (temperatura di 20 <a href="/wiki/Celsius" class="mw-redirect" title="Celsius">°C</a>).<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <tbody><tr> <th>Materiale</th> <th>Resistività (Ωm) </th></tr> <tr> <td><a href="/wiki/Grafene" title="Grafene">Grafene trasparente</a> </td> <td>1,00 x 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Argento" title="Argento">Argento</a></td> <td>1,62 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Rame" title="Rame">Rame</a></td> <td>1,68 x 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Oro" title="Oro">Oro</a></td> <td>2,35 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Alluminio" title="Alluminio">Alluminio</a></td> <td>2,75 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Tungsteno" title="Tungsteno">Tungsteno</a></td> <td>5,25 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Ferro" title="Ferro">Ferro</a></td> <td>9,68 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Platino" title="Platino">Platino</a></td> <td>10,6 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Costantana" title="Costantana">Costantana</a> </td> <td>circa 50 × 10<sup>−8</sup> </td></tr> <tr> <td>Nichel-Cromo </td> <td>circa 106 × 10<sup>-8</sup> </td></tr> <tr> <td><a href="/wiki/Kanthal" title="Kanthal">Kanthal</a> </td> <td>circa 140 × 10<sup>−8</sup> </td></tr> <tr> <td><a href="/wiki/Acqua_di_mare" title="Acqua di mare">Acqua di mare</a></td> <td>2,00 × 10<sup>−1</sup> </td></tr> <tr> <td><a href="/wiki/Acqua_potabile" title="Acqua potabile">Acqua potabile</a></td> <td>tra 2,00×10<sup>1</sup> e 2,00×10<sup>3</sup> </td></tr> <tr> <td><a href="/wiki/Silicio" title="Silicio">Silicio</a> puro (non <a href="/wiki/Drogaggio" title="Drogaggio">drogato</a>)</td> <td>2,5 × 10<sup>3</sup> </td></tr> <tr> <td><a href="/wiki/Vetro" title="Vetro">Vetro</a></td> <td>tra 10<sup>10</sup> e 10<sup>14</sup> </td></tr> <tr> <td><a href="/wiki/Quarzo" title="Quarzo">Quarzo</a> fuso</td> <td>circa 10<sup>16</sup> </td></tr></tbody></table> <p>La tabella permette di capire facilmente perché il rame sia ampiamente usato per realizzare cavi elettrici. Il rame è quindi usato per linee elettriche di sezione inferiore, fili e cavi elettrici di uso comune, avvolgimenti dei motori e dei trasformatori. Per le linee elettriche con sezione maggiore viene invece utilizzato l'alluminio, che a fronte di una maggiore resistività rispetto al rame (e quindi a parità di corrente si utilizzano sezioni maggiori), ha i vantaggi di un peso specifico e costo inferiori, rendendo tra l'altro possibili campate di maggior lunghezza. L'argento è leggermente migliore del rame, ma è decisamente più costoso. </p><p>Nei materiali non omogenei, e in particolare quelli permeabili all'acqua, come il terreno o il legno, la percentuale di acqua influenza notevolmente il valore di resistività. </p> <div class="mw-heading mw-heading2"><h2 id="Unità_di_misura"><span id="Unit.C3.A0_di_misura"></span>Unità di misura</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=8" title="Modifica la sezione Unità di misura" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=8" title="Edit section's source code: Unità di misura"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>L'unità di misura della resistività è l'ohm per metro <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 \!\cdot \!\mathrm {m} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Ω</mi> <mspace width="negativethinmathspace" /> <mo>⋅</mo> <mspace width="negativethinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">m</mi> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Omega \!\cdot \!\mathrm {m} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1350cc58327c50d985e721fb7687f88e29a8b026" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:4.519ex; height:2.176ex;" alt="{\displaystyle \Omega \!\cdot \!\mathrm {m} }"></span> </p><p>L'unità di misura della conducibilità elettrica (o conduttività elettrica) è <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 \mathrm {\frac {S}{m}} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi mathvariant="normal">S</mi> <mi mathvariant="normal">m</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \mathrm {\frac {S}{m}} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0a2b705a93805bc881cf81244d629da5a67cacee" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:2.772ex; height:5.343ex;" alt="{\displaystyle \mathrm {\frac {S}{m}} }"></span> </p><p>Nella progettazione di impianti elettrici, si preferisce utilizzare l'ohm per millimetro quadrato/metro <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 \!\cdot \!\mathrm {mm^{2}/m} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Ω</mi> <mspace width="negativethinmathspace" /> <mo>⋅</mo> <mspace width="negativethinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">m</mi> <msup> <mi mathvariant="normal">m</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mi mathvariant="normal">m</mi> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Omega \!\cdot \!\mathrm {mm^{2}/m} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/1cd81844498d5517a69a5477996fa31b198b828c" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:10.607ex; height:3.176ex;" alt="{\displaystyle \Omega \!\cdot \!\mathrm {mm^{2}/m} }"></span>. Esso è un multiplo dell'ohm per metro e può essere ricavato moltiplicando il valore della tabella sopra riportata per 10<sup>6</sup>. </p><p>Esempio con il rame: 1,68 × 10<sup>-8</sup> Ωm moltiplicato 10<sup>6</sup> = 0,0168 Ωmm<sup>2</sup>/m. Tale valore rappresenta in maniera molto pratica ed immediata la resistenza di un filo di rame lungo 1 metro e della sezione di 1 millimetro quadrato. </p> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=9" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=9" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text"><cite class="citation libro" style="font-style:normal"> Alessandro Bettini, <span style="font-style:italic;">Elettromagnetismo</span>, Zanichelli, 2001, p. 165.</cite></span> </li> <li id="cite_note-2"><a href="#cite_ref-2"><b>^</b></a> <span class="reference-text"><cite class="citation libro" style="font-style:normal"> Raymond A. Serway e John W. Jewett, <span style="font-style:italic;">Principi di fisica</span>, Edises, 2015, p. 702.</cite></span> </li> <li id="cite_note-Tur222-3"><a href="#cite_ref-Tur222_3-0"><b>^</b></a> <span class="reference-text">Resnick-Halliday-Krane, Fisica 2 IV edizione</span> </li> <li id="cite_note-4"><a href="#cite_ref-4"><b>^</b></a> <span class="reference-text">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <cite class="citation libro" style="font-style:normal"> David Halliday, Robert Resnick, Jearl Walker, <span style="font-style:italic;">Fundamentals of Physics Extended</span>, 8ª ed., Wiley, 2008, p. 689, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/978-0-471-75801-3" title="Speciale:RicercaISBN/978-0-471-75801-3">978-0-471-75801-3</a>.</cite></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Bibliografia">Bibliografia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=10" title="Modifica la sezione Bibliografia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=10" title="Edit section's source code: Bibliografia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite class="citation libro" style="font-style:normal"> Alessandro Bettini, <span style="font-style:italic;">Elettromagnetismo</span>, Zanichelli, 2001, p. 165, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/978-8808038234" title="Speciale:RicercaISBN/978-8808038234">978-8808038234</a>.</cite></li> <li><cite class="citation libro" style="font-style:normal"> Raymond A. Serway e John W. Jewett, <span style="font-style:italic;">Principi di fisica</span>, Edises, 2015, p. 702, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/978-8879598644" title="Speciale:RicercaISBN/978-8879598644">978-8879598644</a>.</cite></li> <li><cite id="CITEREFTurchetti" class="citation libro" style="font-style:normal"> Enrico Turchetti, Romana Fasi, <a rel="nofollow" class="external text" href="http://books.google.it/books?id=17cjPQAACAAJ"><span style="font-style:italic;">Elementi di Fisica</span></a>, 1ª ed., Zanichelli, 1998, <a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/Speciale:RicercaISBN/88-08-09755-2" title="Speciale:RicercaISBN/88-08-09755-2">88-08-09755-2</a>.</cite></li> <li>(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) E. F. Northrup <i><a rel="nofollow" class="external text" href="https://www.archive.org/details/methodsofmeasuri00nortrich">Methods of measuring electrical resistance</a></i> (New York, McGraw-Hill book company 1912)</li> <li>(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) H. L. Curtis <i><a rel="nofollow" class="external text" href="https://www.archive.org/details/electricalmeasur031030mbp">Electrical Measurements</a> </i>(New York, Mcgraw Hill Book Company Inc., 1937)</li></ul> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=11" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=11" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Resistivit%C3%A0_di_superficie" title="Resistività di superficie">Resistività di superficie</a></li> <li><a href="/wiki/Resistenza_elettrica" title="Resistenza elettrica">Resistenza elettrica</a></li> <li><a href="/wiki/Conduttivit%C3%A0_elettrica" title="Conduttività elettrica">Conduttività elettrica</a></li> <li><a href="/wiki/Resistivit%C3%A0_idraulica" class="mw-redirect" title="Resistività idraulica">Resistività idraulica</a></li> <li><a href="/w/index.php?title=Resistivit%C3%A0_termica&action=edit&redlink=1" class="new" title="Resistività termica (la pagina non esiste)">Resistività termica</a></li> <li><a href="/wiki/Legge_di_Ohm" title="Legge di Ohm">Legge di Ohm</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Altri_progetti">Altri progetti</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=12" title="Modifica la sezione Altri progetti" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=12" title="Edit section's source code: Altri progetti"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div id="interProject" class="toccolours" style="display: none; clear: both; margin-top: 2em"><p id="sisterProjects" style="background-color: #efefef; color: black; font-weight: bold; margin: 0"><span>Altri progetti</span></p><ul title="Collegamenti verso gli altri progetti Wikimedia"> <li class="" title=""><a href="https://it.wiktionary.org/wiki/resistivit%C3%A0" class="extiw" title="wikt:resistività">Wikizionario</a></li> <li class="" title=""><span class="plainlinks" title="commons:Category:Electrical resistivity"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Electrical_resistivity?uselang=it">Wikimedia Commons</a></span></li></ul></div> <ul><li><span typeof="mw:File"><a href="https://it.wiktionary.org/wiki/" title="Collabora a Wikizionario"><img alt="Collabora a Wikizionario" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Wiktionary_small.svg/18px-Wiktionary_small.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Wiktionary_small.svg/27px-Wiktionary_small.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Wiktionary_small.svg/36px-Wiktionary_small.svg.png 2x" data-file-width="350" data-file-height="350" /></a></span> <a href="https://it.wiktionary.org/wiki/" class="extiw" title="wikt:">Wikizionario</a> contiene il lemma di dizionario «<b><a href="https://it.wiktionary.org/wiki/resistivit%C3%A0" class="extiw" title="wikt:resistività">resistività</a></b>»</li> <li><span typeof="mw:File"><a href="https://commons.wikimedia.org/wiki/?uselang=it" title="Collabora a Wikimedia Commons"><img alt="Collabora a Wikimedia Commons" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png" decoding="async" width="18" height="24" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/27px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/36px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></a></span> <span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/?uselang=it">Wikimedia Commons</a></span> contiene immagini o altri file su <b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Electrical_resistivity?uselang=it">resistività elettrica</a></span></b></li></ul> <div class="mw-heading mw-heading2"><h2 id="Collegamenti_esterni">Collegamenti esterni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&veaction=edit&section=13" title="Modifica la sezione Collegamenti esterni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Resistivit%C3%A0_elettrica&action=edit&section=13" title="Edit section's source code: Collegamenti esterni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li class="mw-empty-elt"></li> <li><cite id="CITEREFTreccani.it" class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="https://www.treccani.it/enciclopedia/resistivita"><span style="font-style:italic;">resistività</span></a>, su <span style="font-style:italic;">Treccani.it – Enciclopedie on line</span>, <a href="/wiki/Istituto_dell%27Enciclopedia_Italiana" title="Istituto dell'Enciclopedia Italiana">Istituto dell'Enciclopedia Italiana</a>.</cite> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q108193#P3365" title="Modifica su Wikidata"><img alt="Modifica su Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/10px-Blue_pencil.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/15px-Blue_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/20px-Blue_pencil.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></li> <li><cite id="CITEREFBritannica.com" class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="https://www.britannica.com/science/resistivity"><span style="font-style:italic;">resistivity</span></a>, su <span style="font-style:italic;"><a href="/wiki/Enciclopedia_Britannica" title="Enciclopedia Britannica">Enciclopedia Britannica</a></span>, Encyclopædia Britannica, Inc.</cite> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q108193#P1417" title="Modifica su Wikidata"><img alt="Modifica su Wikidata" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/10px-Blue_pencil.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/15px-Blue_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/73/Blue_pencil.svg/20px-Blue_pencil.svg.png 2x" data-file-width="600" data-file-height="600" /></a></span></li> <li><cite class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="http://goldbook.iupac.org/R05316.html"><span style="font-style:italic;">IUPAC Gold Book, "resistivity"</span></a>, su <span style="font-style:italic;">goldbook.iupac.org</span>.</cite></li> <li><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="http://www.itchiavari.org/chimica/tabelle/resistivita.html"><span style="font-style:italic;">Tavola delle resistività di alcuni materiali (calcolati a 20 °C)</span></a>, su <span style="font-style:italic;">itchiavari.org</span>.</cite></li> <li><cite class="citation web" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) <a rel="nofollow" class="external text" href="https://web.archive.org/web/20071028200217/http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_1.html"><span style="font-style:italic;">Kaye and Laby Tables of Physical and chemical constants (16th edition, 1995)</span></a>, su <span style="font-style:italic;">kayelaby.npl.co.uk</span>. <small>URL consultato il 30 settembre 2007</small> <small>(archiviato dall'<abbr title="http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_1.html">url originale</abbr> il 28 ottobre 2007)</small>.</cite></li></ul> <style data-mw-deduplicate="TemplateStyles:r140554510">.mw-parser-output .CdA{border:1px solid #aaa;width:100%;margin:auto;font-size:90%;padding:2px}.mw-parser-output .CdA th{background-color:#f2f2f2;font-weight:bold;width:20%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .CdA{border-color:#54595D}html.skin-theme-clientpref-night .mw-parser-output .CdA th{background-color:#202122}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .CdA{border-color:#54595D}html.skin-theme-clientpref-os .mw-parser-output .CdA th{background-color:#202122}}</style><table class="CdA"><tbody><tr><th><a href="/wiki/Aiuto:Controllo_di_autorit%C3%A0" title="Aiuto:Controllo di autorità">Controllo di autorità</a></th><td><a href="/wiki/Gemeinsame_Normdatei" title="Gemeinsame Normdatei">GND</a> <span class="uid">(<span style="font-weight:bolder; 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