A.开关S1接a,闭合开关S后,电压表V示数减小,电流表A示数增大 |
B.开关S1接a,闭合开关S后,原线圈输入功率减小 |
C.断开开关S,开关S1接a时电流表的示数为I1,开关S1接b时电流表的示数为I2,则I1>I2 |
D.断开开关S,开关S1接a时原线圈输入功率为P1,开关S1接b时原线圈输入功率为P2,则P1<P2 |
A.断开开关S,按图2连接好电路; |
B.把滑动变阻器R的滑片P滑到b端; |
C.将电阻箱R0的阻值调到零; |
D.闭合开关S; |
A.电流表(0~3mA,内阻为2.0Ω) |
B.电流表(0~3mA,内阻未知) |
C.电流表(0~0.3A,内阻为5.0Ω |
D.电流表(0~0.3A,内阻未知) |
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