题目内容
如图所示电路,已知R1=3 kΩ,R2=2 kΩ,R3=1 kΩ,I=10 mA,I1=6 mA,则a、b两点电势高低和通过R2中电流正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306376593119.png)
A.a比b高,4 mA |
B.a比b高,2 mA |
C.a比b低,7 mA |
D.a比b低,4mA |
C
根据:
可知R1两端电压
, R2两端电压
;所以a比b低14V,所以R2两端电压为14V,
,
故选C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130637690452.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130637737707.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130637784930.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130637831871.png)
故选C.
![](http://thumb2018.1010pic.com/images/loading.gif)
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