题目内容
如图11所示,理想变压器原线圈中输入电压U1=3300V,副线圈两端电压U2为220V,输出端连有完全相同的两个灯泡L1和L2,绕过铁芯的导线所接的电压表V的示数U=2V,求:
(1)原线圈n1等于多少匝?
(2)当开关S断开时,表A2的示数I2=5A,则表A1的示数I1为多少?
(3)当开关S闭合时,表A1的示数I1′等于多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159287023632.gif)
(1)原线圈n1等于多少匝?
(2)当开关S断开时,表A2的示数I2=5A,则表A1的示数I1为多少?
(3)当开关S闭合时,表A1的示数I1′等于多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159287023632.gif)
(1)1650匝 (2)0.33A (3)0.67A
⑴设伏特表所接线圈输出端电压为U3
则
-------------------- 2分
⑵
--------------3分
⑶S合I2′=2I2="10A " U1I1′=U2I2′ I1′=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115928765944.gif)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115928702450.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115928718800.gif)
⑵
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115928734452.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115928749926.gif)
⑶S合I2′=2I2="10A " U1I1′=U2I2′ I1′=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115928765944.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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