小明用如图4所示的器材探究“影响电阻大小的因素”。a、b为长度一

小明用如图4所示的器材探究“影响电阻大小的因素”。ab为长度一样的镍铬合金丝,ba的横截面积大。关于此实验,下列说法正确的是:

A小灯泡越亮,表示接入的合金丝电阻越大

B利用此装置只能探究导体电阻大小和横截

面积的关系

C利用此装置能探究导体电阻大小和横截面

积、长度的关系

D为了准确比较两条合金丝的电阻,可在电

路中串联一个电压表

答案

C

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