题目内容
如图所示,一理想变压器原线圈匝数n1=1 000匝,副线圈匝数n2=200匝,原线圈接交变电源,交变电源电压u=220
sin 100πt(V)。副线圈接电动机,电阻为11 Ω,电流表A2示数为1.0A,电表对电路的影响忽略不计。则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345018143093.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134501705313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345018143093.jpg)
A.此交流电的频率为100 Hz |
B.电压表示数为220![]() |
C.电流表A1示数为5.0A |
D.此电动机输出功率为33W |
D
由交变电源电压u=220
sin 100πt(V)得
,T=
,f=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502282619.png)
A错;电压表示数为电压的有效值U1=
V,B错;由
得
A,C错;电动机输出功率为
=p-
=U2I2-I22r,
得
=
V,所以
=44
1-12
11=33W,D对。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134501705313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502048790.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502111456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502282619.png)
A错;电压表示数为电压的有效值U1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502329934.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502360622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241345024231066.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502470394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502501453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502579645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502626676.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502704754.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502470394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502813214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134502813214.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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