题目内容
如图是霓虹灯的供电电路,电路中的变压器可视为理想变压器,已知变压器原线圈与副线圈匝数比
,加在原线圈的电压为
(V),霓虹灯正常工作的电阻R=440 kΩ,I1、I2表示原、副线圈中的电流,下列判断正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242247488842389.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224746279605.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224747511748.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242247488842389.png)
A.副线圈两端电压6220 V,副线圈中的电流14.1 mA |
B.副线圈两端电压4400 V,副线圈中的电流10.0 mA |
C.I1<I2 |
D.I1>I2 |
BD
试题分析:原线圈电压有效值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224749711917.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224750600661.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224751474490.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224752488614.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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