A.与副线圈并联的电压表在时的示数为0 |
B.与副线圈并联的电压表在时的示数为V |
C.当原线圈所接正弦交变电压的频率变为100Hz时,灯泡L1变亮,灯泡L2变暗 |
D.当原线圈所接正弦交变电压的频率变为100Hz时,灯泡L1变暗,灯泡L2变亮 |
A.周期T = 0.01s | B.频率f = 50Hz |
C.电压有效值V | D.用交流电压表测量时读数为220V |
A.1.41A,14.1V | B.1.41A,20V | C.2A,20V | D.2A,14.1V |
A.变压器输入电压的有效值为240V | B.变压器输入电压的最大值为240V |
C.变压器输入功率为40W | D.变压器输入功率大于40W |
A.5V | B.5V | C.10V | D.10V |
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