如下图所示电路，电源两端电压保持不变，闭合开关S后，滑动变阻

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如下图所示电路，电源两端电压保持不变，闭合开关S后，滑动变阻器的滑片P向左移动，下列说法中正确的是：

A．电流表A的示数变大，电压表

的示数变小

B．电流表A的示数变大，电压表

的示数变小

C．电压表

与电流表A的示数之比保持不变

D．电压表

与电压表

的示数之差保持不变

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