题目内容
用220V的正弦交流电通过理想变压器对一负载供电,变压器输出电压是380V,通过负载的电流图象如图所示,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040424002743.png)
A.变压器原线圈中电流的频率为50Hz
B.变压器的输入功率38W
C.变压器原、副线圈的匝数比是19:11
D.负载电流的函数表达式i="0.1sin50πt" (A)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040424002743.png)
A.变压器原线圈中电流的频率为50Hz
B.变压器的输入功率38W
C.变压器原、副线圈的匝数比是19:11
D.负载电流的函数表达式i="0.1sin50πt" (A)
A
试题分析:交流电的周期为0.02s,频率为50Hz,A正确;变压器的输出电流有效值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004042431464.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004042447622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004042447622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004042478673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004042509942.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004042525549.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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