單項(xiàng)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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2.單項(xiàng)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

5.單項(xiàng)選擇題For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has().

A.half the resistance of the other resistor
B.a resistance equal to the other
C.at least ten times the resistance of the other
D.a partial short circuit