题目内容
一理想变压器变压比为20∶1,原线圈接入220V电压时,将副线圈拆去18匝,输出电压为8V,则该变压器原线圈的匝数应为( )
A.495匝 | B.1320匝 |
C.2640匝 | D.990匝 |
B
试题分析:根据理想变压器的变压比关系:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242024274191027.png)
又
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202428199615.png)
联立就可以求出
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824202428994580.png)
点评:本题难度较小,熟记变压器匝数比与电压比的关系
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.495匝 | B.1320匝 |
C.2640匝 | D.990匝 |