A. | B. | C. | D. |
5 |
3 |
U |
R |
3U |
5R2 |
U |
R1 |
3U |
2R2 |
5 |
3 |
U |
R |
3U |
5R2 |
U |
R2 |
U |
R2 |
R1R2 |
R1+R2 |
2 |
5 |
U |
R′ |
5U |
2R2 |
A.O.25A~0.6A,1V~2V | B.O.3A~O.5A,1V~1.5V |
C.O.25A~0.5A,1.5V~2V | D.O.25A~0.5A,1V~2V |
A.电流表示数变小 |
B.电压表示数变小 |
C.电压表与电流表的示数之比不变 |
D.灯两端电压变小,灯变暗 |
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