单项选择题
A transformer in an electric circuit serves to （）
A.generate its own electrical power
B.transform electrical energy into mechanical energy
C.increase or decrease circuit voltage as required
D.convert AC current to DC current
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相关考题
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When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）
A.Glass
B.Bakelite
C.Soft iron
D.Aluminum -
单项选择题
An ohmmeter can be used to measure（）
A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
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单项选择题
The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.
A.droop
B.drop
C.dip
D.regulation
