题目内容
如图所示,一理想变压器初次级线圈的匝数比为3∶1,次级接三个相同的灯泡,均能正常发光,初级线圈中串有一个相同的灯泡L,则 ( )
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242128063994419.jpg)
A.灯L也能正常发光 | B.灯L比另三灯都暗 |
C.灯L将会被烧坏 | D.不能确定 |
A
试题分析:因为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212807008659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212808053861.png)
副线圈上三个灯泡均正常发光,每个灯泡的电流均一样为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212809067522.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212810221446.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212811360411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212812655584.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212813856591.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824212814979377.png)
故选A
点评:变压器规律:(1)应用匝数之比等于电压之比(2)应用电流之比等于匝数反比(3)应用欧姆定律和输入功率等于输出功率
![](http://thumb2018.1010pic.com/images/loading.gif)
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