A.250V | B.352.5V | C.203.8V | D.327.5V |
A.增大副线圈负载R的阻值 | B.减小R的阻值 |
C.增大副线圈匝数n2 | D.减小原线圈的匝数n1 |
A.V示数变大,A示数变小,R1消耗的电功率变大 |
B.V示数变大,A示数变大,R1消耗的电功率大 |
C.V示数变小,A示数变小,R1消耗的电功率变小 |
D.V示数变小,A示数变大,R1消耗的电功率变小 |
A.灯L变亮 |
B.各个电表读数均变大 |
C.因为不变,所以不变 |
D.变大,且始终有 |
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