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随时间t的变化规律如图所示,副线圈仅接入一个10 Ω的电阻,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241432123462203.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241432123462203.png)
A.流过电阻的最大电流是20 A |
B.与电阻并联的电压表的示数是141 V |
C.变压器的输入功率是2.2×103W |
D.在交变电流变化的一个周期内,电阻产生的焦耳热是20 J |
D
由图象可知电压峰值为220
,有效值
,由
,与电阻并联的电压表的示数为10V,B错;输出功率为
,C错;D对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143212408336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143212471844.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143212580979.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143212673892.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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