题目内容
在如图所示电路中,R1、R2、R3三个电阻消耗的电功率都相等。由此可知( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241603598731441.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241603598731441.png)
A.电阻R1=R2=4R3 | B.电阻R1+R2=R3 |
C.电流I1=I2=2I3 | D.电流I1+I2=I3 |
AD
试题分析:由R1和R2并联且电功率相等,由此可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160400091860.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160400294481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160400497783.png)
点评:本题难度较小,明确电阻的串并联关系,如果是并联,电功率用公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160400715503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160400949404.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.电阻R1=R2=4R3 | B.电阻R1+R2=R3 |
C.电流I1=I2=2I3 | D.电流I1+I2=I3 |