题目内容
如下图所示,电阻R1 = R2 = 6Ω,滑动变阻器的总阻值R3 = 12Ω,则A、B间总电阻的取值范围是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130805643404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130805643404.png)
A.10~12Ω | B.6~10Ω |
C.6~12Ω | D.10~18Ω |
B
当滑动变阻器的触头在最左端时,只有R2连入电路,所以AB间的总电阻为6Ω,当滑动变阻器的触头在最右端时,
并联再和
串联,所以电路总电阻为
,为10Ω,所以选B。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130805706428.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130805737361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130805862761.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.10~12Ω | B.6~10Ω |
C.6~12Ω | D.10~18Ω |