题目内容
甲、乙两个电阻,它们的伏安特性曲线画在一个坐标系中如图7-1-16所示,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241417055323492.jpg)
图7-1-16
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241417055323492.jpg)
图7-1-16
A.甲的电阻是乙的电阻的两倍 |
B.把两个电阻两端加上相同的电压,通过甲的电流是通过乙的两倍 |
C.欲使通过两个电阻有相同的电流,加在乙两端的电压是加在甲两端电压的3倍 |
D.若两电阻是由同一种规格的电阻丝制成,甲电阻丝的长度是乙的![]() |
C
选C.由I-U图线可知,电阻为图线斜率的倒数,则有
=
,A错误.当U相同时由I=
知
=
=
,B错误.当I相同时由U=IR知
=
,C正确.当ρ相同时由R=
知
=
,
=
,D错误.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705563496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705688327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705735434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705797455.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705937493.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141706000334.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141706187510.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705688327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141706374487.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705563496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141706655610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141706717493.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141705688327.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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