题目内容
如图所示,一理想变压器原线圈匝数为n1=1000匝,副线圈匝数为n2=200匝,将原线
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210251365561.png)
圈接在u=200sin120πt(V)的交流电压上,已知电阻R=100Ω,电流表A为理想交流电表.则下列推断不正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210251365561.png)
圈接在u=200sin120πt(V)的交流电压上,已知电阻R=100Ω,电流表A为理想交流电表.则下列推断不正确的是
A.交流电的频率为50Hz |
B.穿过铁芯的磁通量的最大变化率为0.2Wb/s |
C.电流表A的示数为0.4A |
D.变压器的输入功率是16W |
ABC
分析:根据电压与匝数程正比,电流与匝数成反比,变压器的输入功率和输出功率相等,逐项分析即可得出结论。
解答:A、接入电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025167693.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025198463.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025401650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025495492.png)
B、根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025557571.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210255731214.png)
C、根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025635454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025682480.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025713558.png)
D、
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025729600.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121025744563.png)
答案:ABC。
![](http://thumb2018.1010pic.com/images/loading.gif)
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