题目内容
一理想变压器原、副线圈匝数比n1∶n2=11∶5.原线圈与正弦交变电源连接,输入电压u如图所示.副线圈仅接入一个10 Ω的电阻.则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241916429722695.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241916429722695.png)
A.流过电阻的电流是10 A |
B.与电阻并联的电压表的示数是100 V |
C.经过1分钟电阻发出的热量是6×103 J |
D.变压器的输入功率是1×103 W |
ABD
试题分析:根据原、副线圈电压与匝数的关系,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191643253653.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191643549591.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191643846575.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191644267533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191644548377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191644829566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191645203506.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191645546800.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191645827610.png)
故选ABD
点评:中等偏易。解决有关变压器原、副线圈电压、电流、功率关系的问题时,一般先根据电压比等于匝数比确定电压,然后根据输入功率等于输出功率确定电流关系.
![](http://thumb2018.1010pic.com/images/loading.gif)
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