题目内容
远距离输电时,为了减少输送过程中的热损耗,常采用____输电(选填“高压”或“低压”).在输电线路上若有一个如图所示的理想变压器,其原线圈匝数n1小于副线圈匝数n2,则原线圈两端的电压U1___副线圈两端的电压U2(选填大于、小于或等于).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241259031371822.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241259031371822.png)
高压;小于
提高输送电压,根据公式
,输送功率一定,可得输送电流减小,根据公式
可得,输送过程中热损耗减小,所以常采用高压输电。原线圈匝数n1小于副线圈匝数n2,故该变压器为降压变压器,根据公式
,可得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125903246482.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125903168451.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125903199708.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125903215638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125903246482.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目