單項選擇題

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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單項選擇題

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

單項選擇題

An ohmmeter can be used to measure（）

A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power