单项选择题
A.the voltage between two points in a circuit B.circuit continuity C.current flow in a circuit D.total or partial circuit resistance
When the voltage remains constant and the resistance is...
单项选择题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
The power factor of an AC generator operating singularl...
单项选择题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
The resistance of electric wire will decrease as its （）...
单项选择题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
