题目内容
如图所示,理想变压器的原线圈接入
(V)的交变电压,副线圈通过电阻
=5Ω的输电导线对“220V/88W”纯电阻用电器
供电,该电器正常工作. 由此可知( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241659469991606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165946344626.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165946578260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165946796299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241659469991606.png)
A.原、副线圈的匝数比为1:20 |
B.交变电压的频率为50HZ |
C.变压器的输入功率为88W |
D.副线圈中电流的有效值为0.4A |
D
试题分析:根据变压器以及交流电的相关知识,输入电压的有效值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165947202531.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824165947654623.png)
点评:本题考查了常见的变压器的题型,通过输入输出电压计算原副线圈匝数之比、通过输出功率计算输入电流。
![](http://thumb2018.1010pic.com/images/loading.gif)
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