题目内容
截面积和长度均相同的A、B两个电阻,它们的伏安特性曲线如图所示,下列判断正确的是
A.电阻A、B的阻值RA>RB
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241531367181990.jpg)
B.A材料的电阻率小于B材料的电阻率
C.若两电阻并联,电阻A消耗的功率大
D.若两电阻串联,电阻A消耗的功率大
A.电阻A、B的阻值RA>RB
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241531367181990.jpg)
B.A材料的电阻率小于B材料的电阻率
C.若两电阻并联,电阻A消耗的功率大
D.若两电阻串联,电阻A消耗的功率大
BC
试题分析:由欧姆定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153136780725.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153136843590.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153137046481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153137108607.png)
点评:难度较小,注意本题图中,纵坐标表示电流I,斜率表示电阻的倒数,电功率利用哪一个公式,根据电流或电压相等
![](http://thumb2018.1010pic.com/images/loading.gif)
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