E |
R+r |
B2L2v |
R+r |
B2L2v |
R+r |
| ||
BL |
| ||
2×1 |
E |
R+r |
1 |
2 |
v | 24 |
| ||
P |
| ||
18 |
A.通过R2的电流减小 |
B.电源的路端电压减小 |
C.电容器C所带的电荷量增加 |
D.电源的效率增大 |
A.E1=E2,内电阻r1>r2 |
B.E1=E2,发生短路时I1>I2 |
C.E1<E2,内电阻r1>r2 |
D.E1<E2,发生短路时I1>I2 |
A.两表读数均变大 |
B.两表读数均变小 |
C.电流表读数增大,电压表读数减小 |
D.电流表读数减小,电压表读数增大 |
A. | B. | C. | D. |
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