题目内容
如图所示,理想变压器原线圈输入电压为220 V,副线圈输出电压为36 V,两只灯泡的额定电压均为36 V,L1额定功率为12 W,L2额定功率为6 W.试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241643502963642.jpg)
(1)原副线圈的匝数比是多少?
(2)S闭合后,两灯均工作时原线圈的电流。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241643502963642.jpg)
(1)原副线圈的匝数比是多少?
(2)S闭合后,两灯均工作时原线圈的电流。
(1)
(2)0.082A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164350312412.png)
试题分析:(1)原副线圈的匝数比
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241643505771104.png)
(2)通过L1的电流为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241643507961008.png)
通过L2的电流为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164351123957.png)
副线圈电流为I=I1+I2=0.5A
设原线圈电流为I0:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164351373620.png)
解得:I0=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164351544425.png)
点评:只要知道变压器的特点,本题不难,但是要注意解题格式要规范.
![](http://thumb2018.1010pic.com/images/loading.gif)
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