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
单项选择题 The power factor of an AC generator operating singularly is determined by the （）
单项选择题 The resistance of electric wire will decrease as its （）
单项选择题 The total power consumed in a parallel circuit is （）
