题目内容
如右图所示,三个电阻
、
、
的阻值相同,允许消耗的最大功率分别为
、
、
,则此电路中允许消耗的最大功率为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154511117915.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154510384327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154510478359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154510618368.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154510712481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154510712481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154511024471.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154511117915.png)
A.![]() | B.![]() | C.![]() | D.![]() |
B
试题分析:由串并联关系可知R1通过的电流最大,R2和R3两端电压相同,所以R3功率为2W,此时R2功率为2W,干路电流为支路电流的2倍,由热功率公式可知R1功率为8W,电路中总功率为12W,故选B
点评:难度较小,明确电路中串并联关系,判断R3达到最大功率
![](http://thumb2018.1010pic.com/images/loading.gif)
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