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一、选择题（选择一个正确答案，共15题，每题2分，计30分）
1．根据欧姆定律可以得到R=U/I，由此下列判断正确的是（ ）
A．导体的电阻跟加在它两端的电压成正比，电压为零时电阻就等于零
B．导体的电阻跟通过它的电流成反比，没有电流通过时就没有电阻
C．导体的电阻等于加在它两端电压跟通过它的电流的比值
D．以上说法都不正确
2．某同学在探究“电流跟电压、电阻的关系”时，根据收集到的数据画出了如图1所示的一个图像，下列结论与图像相符的是（ ）
图1
A．电阻一定时，电流随着电压的增大而增大
B．电阻一定时，电压随着电流的增大而增大
C．电压一定时，电流随着电阻的增大而减小
D．电压一定时，电阻随着电流的增大而减小
3．如图2示，AB和BC是由同种材料制成的长度相同、横截面积不同的两段导体，串联后连入电路中，比较这两段导体两端的电压及通过它们的电流的大小，有（ ）
图2
A．UAB>UBC，IAB
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