题目内容
如图所示,图线1表示的导体的电阻为R1,图线2表示的导体的电阻为R2,则下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241506328131417.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241506328131417.png)
A.R1∶R2=1∶3 |
B.把R1拉长到原来的3倍长后电阻等于R2 |
C.将R1与R2串联后接于电源上,则功率之比p1∶p2=1∶3 |
D.将R1与R2并联后接于电源上,则电流比I1∶I2=3∶1 |
ACD
试题分析:根据I-U图象知,图线的斜率表示电阻的倒数,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150633031584.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150633281555.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150633421327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150633687488.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150633858451.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150634061566.png)
点评:解决本题的关键知道I-U图线的斜率表示电阻的倒数以及知道串并联电路的特点.
![](http://thumb2018.1010pic.com/images/loading.gif)
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