题目内容
如图所示是电阻R1和R2的伏安特性曲线,并且把第一象限分为Ⅰ、Ⅱ、Ⅲ三个区域.现在把电阻R1和R2并联在电路中,消耗的电功率分别为P1和P2,并联的总电阻设为R,下列关于P1与P2的大小关系及R的伏安特性曲线所在的区域正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241501155082284.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241501155082284.jpg)
A.特性曲线在Ⅰ区,P1<P2 |
B.特性曲线在Ⅲ区,P1>P2 |
C.特性曲线在Ⅰ区,P1>P2 |
D.特性曲线在Ⅲ区,P1<P2 |
C
试题分析:把
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115571327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115618361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115571327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115618361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115571327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115571327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150115618361.png)
点评:本题首先要从数学角度理解图线的物理意义:斜率越大,电阻越小.其次抓住并联电路的基本特点:支路两端的电压相等.
![](http://thumb2018.1010pic.com/images/loading.gif)
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