问题
选择题
如图，电源电压和电灯L的电阻均保持不变。当开关S闭合后，在变阻器的滑片P从中点向下滑动的过程中，下列说法正确的是
A．电压表的示数变大
B．电灯L的亮度变暗
C．电流表A1的示数不变
D．电流表A2的示数变小
答案
答案：D
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如图，电源电压和电灯L的电阻均保持不变。当开关S闭合后，在变阻器的滑片P从中点向下滑动的过程中，下列说法正确的是
A．电压表的示数变大
B．电灯L的亮度变暗
C．电流表A1的示数不变
D．电流表A2的示数变小
答案：D
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