题目内容
如图所示,接于理想变压器中的四个 规格相同的灯泡都正常发光,那么,理想变压器的匝数比n1:n2:n3为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034033204046.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250034033204046.jpg)
A.1:1:1 | B.3:2:1 |
C.6:2:1 | D.2:2:1 |
B
灯泡正常发光,可得
,所以
.由变压器的电压比公式
,所以
.同理,灯泡正常发光,功率相等,即
.由
,得
,即
.由
得
,即
,所以
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403352636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403367545.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403383904.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403398518.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403414619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403430478.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403445593.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403461476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403476683.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403492686.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403508758.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003403523682.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.1:1:1 | B.3:2:1 |
C.6:2:1 | D.2:2:1 |