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Lorsqu'une lampe est allumée , on constate que le passage du courant au niveau du filament échauffe le verre de l'ampoule et produit de la lumière par rayonnement . Cet effet est appelé effet Joule . Cette énergie transmise au milieu extérieur sous forme de chaleur et d'énergie rayonnante est appelée énergie thermique . Elle existe dans tous les dipôles qui possèdent une résistance .

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