On considère une pile de 6V et deux lampes Li(6 V; 60 W) et L2 (6V ; 12 W).
1) Calculer, en fonctionnement normal, l'intensité du courant circulant dans chaque lampe.
2) Faut-il brancher les lampes, en série ou en dérivation avec la pile, pour qu'elles fonctionnent normalement ?
Justifier.
3) Déduire alors l'intensité du courant principal et la puissance Po fournie par la plle.
4) On branche les lampes contrairement à la réponse de la partie 2).
a) Comment devient l'aspect de chaque lampe ? Justifier.
b) La puissance électrique délivrée par la pile est-elle plus grande ou plus petite que Po ? Justifier.
Voici l exercice
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Ответ:
c)0.25is the