單項選擇題

When the voltage remains constant and the resistance is increased in a series circuit, the flow of current （）

A.increases by the square of the original value
B.increases
C.remains the same
D.decreases

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單項選擇題

The power factor of an AC generator operating singularly is determined by the （）

A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage

單項選擇題

The resistance of electric wire will decrease as its （）

A.length increases
B.cross-sectional area increases
C.temperature increases
D.percent of metallic purities increases

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