题目内容
如图(甲)所示,理想变压器的原线圈电路中装有0.5 A的保险丝L,原线圈匝数n1=600,副线圈匝数n2=120.当原线圈接在如图(乙)所示的交流电源上,要使整个电路和用电器正常工作,则副线圈两端可以接( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000505886323.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000505886323.jpg)
A.阻值为12 Ω的电阻 |
B.并联两盏的“36 V 40 W”灯泡 |
C.工作频率为10 Hz的用电设备 |
D.耐压值为36 V的电容器 |
B
试题分析:原线圈电压的有效值为U1="180" V,根据电压关系
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000050604645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000050620811.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000050744824.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000050822620.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000050838492.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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