如图7 所示的电路中, 电源电压不变, R1 为定值电阻, 开关S 闭合后, 滑

如图7 所示的电路中, 电源电压不变, R1 为定值电阻, 开关S 闭合后, 滑动变阻器滑片P 向右移动时, 下列说法正确的是

A. 电流表示数变小, 电压表与电流表示数之比变大

B. 电流表示数变大, 电压表与电流表示数之比不变

C. 电流表示数变小, 电压表与电流表示数之比不变

D. 电压表示数变大, 电压表与电流表示数之比变大

答案

C

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