如图所示的电路中,电源电压恒定不变,当电键K闭合时:A.伏特表示

如图所示的电路中,电源电压恒定不变,当电键K闭合时:

A.伏特表示数变小,安培表示数变小,灯变暗;

B.伏特表示数变大,安培表示数变大,灯变亮;

C.伏特表示数不变,安培表示数不变,灯的亮度不变;

D.伏特表示数不变,安培表示数变小,灯变暗.

答案

C

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