题目内容
电阻R与两个完全相同的理想晶体二极管D1和D2,连接成如图所示的电路,
两端的电势差
时,流经
点的电流为0.01A,当电势差
时流经
点的电流仍为0.01A,则电阻R的阻值为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241316550463702.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131654547396.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131654749634.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131654796283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131654843676.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131654796283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241316550463702.jpg)
A.![]() | B.![]() | C.![]() | D.20![]() |
A
当电势差Uab=-0.2V时,二极管D2导通,正向电压为0.2V,当电势差Uab=10V时,二极管D1导通,电阻两端的电压:U=10-0.2=9.8V。电阻中电流:I=0.01A。故R=U/I=9.8V/0.01A=980Ω,选C.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目