Q
V
Interrupteur ouvert ou fermé
po l'utilise une démarche scientifique
Dans le cir...
Q
V
Interrupteur ouvert ou fermé
po l'utilise une démarche scientifique
Dans le circuit ci-dessous, la tension aux bornes du géné-
rateur est U = 12 V.
ouvert
G
a. Qu
du ré
b. 01
C. QE
R
K
sach
2. D
1. On considère l'interrupteur
COM
a. Le voltmetre V, indique-t-il
une tension U non nulle aux
bornes de la lampe ? Justifier
votre réponse.
b. Quelle tension U, indique le
voltmètre V, aux bornes de la
M
pile? Justifier votre réponse
cQuelle est la tension UX aux
V
COM
bornes de l'interrupteur K?
Justifier votre réponse.
2. On considère l'interrupteur fermé.
a. Quelle est la tension UX aux bornes de l'interrupteur K?
Justifier votre réponse.
b. On a mesuré les tensions aux bornes :
- du récepteur R, UR = 2,2 V;
- du moteur, UM = 3,7 V.
Que vaut la tension U aux bornes de la lampe?
V.
a.
leu
b.
te
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