题目内容
关于闭合电路的性质,以下说法正确的是( )
A.电源短路时,输出电流无限大 |
B.电源断路时,路端电压无限大 |
C.外电路电阻越大,输出电流越大 |
D.外电路电阻越大,路端电压越大 |
D
试题分析:电源被短路时,外电路电阻为零,根据闭合电路欧姆定律,电源电流为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002057173504.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002057188456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002057204494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002057219781.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002057235616.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002057251698.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.电源短路时,输出电流无限大 |
B.电源断路时,路端电压无限大 |
C.外电路电阻越大,输出电流越大 |
D.外电路电阻越大,路端电压越大 |