在做测小灯泡的电阻的实验中,我们发现小灯泡两端的电压减小时,

在做测小灯泡的电阻的实验中,我们发现小灯泡两端的电压减小时,小灯泡的电阻也随之减小,这是因为:

A.导体的电阻与导体两端的电压有关;

B.根据欧姆定律的变形式R=U/I可知:电流一定时,电阻与电压成正比;

C.当电压减小时,小灯泡的亮度变暗,温度变低,所以电阻变小;

D.以上都不对.

答案

C

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