题目内容
某发电厂通过远距离向某学校输电,输送的电功率为P,从发电厂至学校的输电导线总电阻为r,当输电线的电阻和输送的电功率不变时,则下列说法正确的是( )
A.输送的电压越高,输电线上的电流越大,输电线路上损失的电压越大 |
B.输电线路上损失的电压与输送电流成正比 |
C.输电线路上损失的功率跟输送电流的平方成正比 |
D.输电导线总电阻r两端的电压等于输送的电压 |
BC
试题分析:当输电线的电阻和输送的电功率不变时,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180037437452.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180037655570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180037655570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180038186858.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180038404781.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180037655570.png)
故选BC.
点评:解决本题的关键知道输送的电功率
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824180037437452.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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