题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031609-43820.png)
(1)输电线上的升压变压器和降压变压器原、副线圈的匝数比;
(2)用户得到的电功率是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031610-81578.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031610-46997.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031610-21103.png)
P线
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031610-70717.png)
输电线电流
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031610-51115.png)
原线圈通过的电流
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031611-29176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031611-11962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031611-26933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031611-30169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031612-76971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031612-28886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031610-46997.png)
(2)用户得到的电功率P用=P出=P-P损
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031612-59176.png)
核心考点
试题【发电机输出功率为100kW,输出电压为250V,用户需要220V的电压,输电线电阻为,若输电线损失的功率为输送功率的4%,试求:(1)输电线上的升压变压器和降压】;主要考察你对电能的输送等知识点的理解。[详细]
举一反三
A.只有增大导线的电阻,才能减小电流,提高输电效率 |
B.只有提高输电电压,才能减小电流,提高输电效率 |
C.提高输电导线的横截面积,可以减小输电导线上能量的损耗 |
D.如果输电电阻不变,提高输电电压势必增大输电导线上电流 |
A.110V | B.110KV | C.220V | D.55V |
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031518-14817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200117/20200117031519-88723.png)