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Pour tout conducteur ohmique , il existe une limite d'intensité Imax au-delà de laquelle la puissance reçue est trop importante et l'énergie ne peut plus être évacuée rapidement ( par effet Joule ) . Le conducteur ohmique s'échauffe fortement , ce qui provoque sa destruction . Les constructeurs indiquent la valeur puissance maximale admissible , dite puissance nominale Par Exemple : R = 100ohm, 1/2W

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