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Elettroforo perpetuo - Wikipedia
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Disponibile in 19 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-19" 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">19 lingue</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/%D8%AD%D8%A7%D9%85%D9%88%D9%84_%D9%83%D9%87%D8%B1%D8%A8%D8%A7%D8%A1" title="حامول كهرباء - arabo" lang="ar" hreflang="ar" data-title="حامول كهرباء" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Electr%C3%B2for" title="Electròfor - catalano" lang="ca" hreflang="ca" data-title="Electròfor" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Elektrofor" title="Elektrofor - danese" lang="da" hreflang="da" data-title="Elektrofor" 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/Elektrophor" title="Elektrophor - tedesco" lang="de" hreflang="de" data-title="Elektrophor" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Electrophorus" title="Electrophorus - inglese" lang="en" hreflang="en" data-title="Electrophorus" 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/Elektroforo" title="Elektroforo - esperanto" lang="eo" hreflang="eo" data-title="Elektroforo" 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/Electr%C3%B3foro" title="Electróforo - spagnolo" lang="es" hreflang="es" data-title="Electróforo" 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/Elektrofoor" title="Elektrofoor - estone" lang="et" hreflang="et" data-title="Elektrofoor" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D9%84%DA%A9%D8%AA%D8%B1%D9%88%D9%81%D9%88%D8%B1" title="الکتروفور - persiano" lang="fa" hreflang="fa" data-title="الکتروفور" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C3%89lectrophore_de_Volta" title="Électrophore de Volta - francese" lang="fr" hreflang="fr" data-title="Électrophore de Volta" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Elektrof%C3%B3r" title="Elektrofór - ungherese" lang="hu" hreflang="hu" data-title="Elektrofór" data-language-autonym="Magyar" data-language-local-name="ungherese" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Elektroforo" title="Elektroforo - ido" lang="io" hreflang="io" data-title="Elektroforo" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</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%E7%9B%86" title="電気盆 - giapponese" lang="ja" hreflang="ja" data-title="電気盆" 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-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Elektrofoor" title="Elektrofoor - olandese" lang="nl" hreflang="nl" data-title="Elektrofoor" 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/Elektrofor" title="Elektrofor - norvegese nynorsk" lang="nn" hreflang="nn" data-title="Elektrofor" 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-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Elektrofor" title="Elektrofor - polacco" lang="pl" hreflang="pl" data-title="Elektrofor" data-language-autonym="Polski" data-language-local-name="polacco" 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/Eletr%C3%B3foro" 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</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"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Electrophorus_device.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Electrophorus_device.png/220px-Electrophorus_device.png" decoding="async" width="220" height="177" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/92/Electrophorus_device.png/330px-Electrophorus_device.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/92/Electrophorus_device.png/440px-Electrophorus_device.png 2x" data-file-width="603" data-file-height="485" /></a><figcaption>Disegno di un elettroforo di Volta</figcaption></figure> <p>L'<b>elettroforo perpetuo</b>, detto anche <b>elettroforo di Volta</b>, è un <a href="/wiki/Generatore_elettrostatico" title="Generatore elettrostatico">generatore elettrostatico</a> in grado di accumulare una modesta quantità di <a href="/wiki/Carica_elettrica" title="Carica elettrica">carica elettrica</a> in modo discontinuo. Ideato da <a href="/wiki/Alessandro_Volta" title="Alessandro Volta">Alessandro Volta</a> intorno al <a href="/wiki/1775" title="1775">1775</a> durante i suoi studi sull'elettricità e citato nella "<i>Lettera a Priestley</i>", ha attualmente utilità didattica. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Descrizione">Descrizione</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Elettroforo_perpetuo&veaction=edit&section=1" title="Modifica la sezione Descrizione" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Elettroforo_perpetuo&action=edit&section=1" title="Edit section's source code: Descrizione"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>È costituito da un disco di materiale conduttore (chiamato scudo) che si impugna attraverso un manico isolante e viene utilizzato in abbinamento ad una superficie in materiale isolante, per esempio <a href="/wiki/Ebanite" title="Ebanite">ebanite</a>, e ad un panno di <a href="/wiki/Lana" title="Lana">lana</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Funzionamento">Funzionamento</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Elettroforo_perpetuo&veaction=edit&section=2" title="Modifica la sezione Funzionamento" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Elettroforo_perpetuo&action=edit&section=2" title="Edit section's source code: Funzionamento"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>L'elettroforo è uno strumento che permette di generare carica elettrica ed è formato da due differenti parti: un piano composto da un materiale isolante chiamato "schiacciata" (Volta utilizzò la resina perché mantiene la carica per un tempo più lungo) che viene caricato per strofinìo da un panno in lana (<a href="/wiki/Effetto_triboelettrico" title="Effetto triboelettrico">effetto triboelettrico</a>) e si carica negativamente; successivamente viene posto lo "scudo", che è composto da un piatto in materiale conduttore e da un manico in materiale isolante (legno-plastica), sullo stesso piano, e per induzione elettrostatica le cariche positive del piatto conduttore vengono attirate verso l'isolante invece quelle negative vengono respinte sulla parte superiore del piatto e successivamente posando il dito sul piano si viene a creare la "messa a terra" e le cariche negative del piatto fluiscono attraverso il nostro corpo sul terreno, a questo punto il conduttore è carico positivamente e possiamo verificarlo o avvicinandolo ad un altro strumento chiamato elettroscopio che misura la presenza di cariche oppure possiamo avvicinare il dito al piatto e vedremo una scarica tra i due elettrodi (dito-piatto) e ciò è appunto dovuto alla differenza di potenziale grazie alla presenza di cariche solo positive nel piatto. </p> <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=Elettroforo_perpetuo&veaction=edit&section=3" 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=Elettroforo_perpetuo&action=edit&section=3" 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/Alessandro_Volta" title="Alessandro Volta">Alessandro Volta</a></li> <li><a href="/wiki/Bilancia_elettrometrica" title="Bilancia elettrometrica">Bilancia elettrometrica</a></li> <li><a href="/wiki/Condensatore_(elettrotecnica)" title="Condensatore (elettrotecnica)">Condensatore (elettrotecnica)</a></li> <li><a href="/wiki/Elettricit%C3%A0" title="Elettricità">Elettricità</a></li> <li><a href="/wiki/Elettrometro_condensatore" title="Elettrometro condensatore">Elettrometro condensatore</a></li> <li><a href="/wiki/Elettroscopio" title="Elettroscopio">Elettroscopio</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=Elettroforo_perpetuo&veaction=edit&section=4" 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=Elettroforo_perpetuo&action=edit&section=4" 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/elettroforo" class="extiw" title="wikt:elettroforo">Wikizionario</a></li> <li class="" title=""><span class="plainlinks" title="commons:Category:Electrophorus (device)"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Electrophorus_(device)?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/elettroforo" class="extiw" title="wikt:elettroforo">elettroforo</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:Electrophorus_(device)?uselang=it">elettroforo</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=Elettroforo_perpetuo&veaction=edit&section=5" 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=Elettroforo_perpetuo&action=edit&section=5" 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="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/technology/electrophorus"><span style="font-style:italic;">electrophorus</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/Q429766#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></ul> <div class="noprint" style="width:100%; 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