题目内容
小灯泡通电后其电流I随所加电压U变化的图线如图所示,P为图线上一点,PN为图线过P点的切线,PQ为U轴的垂线,PM为I轴的垂线,下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250051420794676.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250051420794676.png)
A.随着所加电压的增大,小灯泡的电阻增大 |
B.对应P点,小灯泡的电阻为R=![]() |
C.对应P点,小灯泡的电阻为R=![]() |
D.对应P点,小灯泡的功率为图中矩形PQOM所围的“面积” |
ABD
试题分析:由图象可知,灯泡的电阻等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005142141551.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005142157809.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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