http://www.outdoorlanternsonsale.com/head-lamp/
un 12-v automobile phare dc doit être utilisé sur un bateau de pêche avec un V-24 du système. La lampe frontale est évalué?
50 W. Une résistance doit être connectée en série avec le lampe pour lui permettre de fonctionner sur 24V. Quel devrait être le degré de résistance et la puissance de la résistance. S'il vous plaît voir les calculs.
Courant requis à 12V = (50/12) = 4.167A. C'est le circuit de courant, il sera également circuler dans la résistance. La chute de V à travers la résistance doit être de 12V. Ainsi, la valeur de la résistance sera (E / I) = 12/4.167, = 2,88 ohms.
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