A.O.9A 1.8W | B.O.6A 1.2W | C.O.3A O.6W | D.1.8A 3.6W |
U1 |
U2 |
IR1 |
IR2 |
R1 |
R2 |
2 |
1 |
I1 |
I2 |
| ||
|
R2 |
R1 |
1 |
2 |
A.定值电阻R两端的电压不断变小 |
B.定值电阻R的功率不断变小 |
C.滑动变阻器两端的电压不断变小 |
D.滑动变阻器的功率先变大后变小 |
A.电流表的示数为0.3A |
B.L2可能不发光或发出较暗的光 |
C.L2的实际功率大于2W |
D.要使L2正常发光,需将滑动变阻器滑片适当向右调节 |
A.变大不变 | B.变大变大 | C.不变变大 | D.不变变小 |
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