题目内容
如图所示为两电阻R1和R2的伏安特性曲线。若在两电阻两端加相同的电压,关于它们的电阻值及发热功率的比较,正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241635170244173.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241635170244173.png)
A.电阻R1的阻值较大 |
B.电阻R2的阻值较大 |
C.电阻R2的发热功率较大 |
D.电阻R1的发热功率较大 |
BD
试题分析:因为该图象是I-U图线,图象的斜率表示电阻的倒数,斜率越大,电阻越小,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163517289361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163517617327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163517960608.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163517617327.png)
点评: 解决本题的关键是搞清I-U图线的斜率表示什么.
![](http://thumb2018.1010pic.com/images/loading.gif)
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