题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003347-77981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003347-99871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003347-54187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003347-61838.jpg)
(1)电源电动势;
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-70487.png)
(3)电键断开时,干路上的电流强度。
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-43721.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-54189.jpg)
电压表测量的是
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-22259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-22259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-49548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-41274.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-14550.png)
电流表测量的是通过
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-61457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-53737.png)
路端电压就等于
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-80610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-99099.png)
内电压U内=
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003350-56312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003350-43308.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-22259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-49548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-70487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-70487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-49548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003350-13112.png)
(3)电键断开后,电阻
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-61457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-70487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-49548.png)
电阻
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003349-61457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003350-71198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003348-70487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003350-91174.png)
整理得最终的外电阻R外=
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003351-40306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003351-68456.png)
核心考点
试题【(15分)如图所示,电源内阻,。当电键闭合时,电流表和电压表的示数分别为1.5A和2V。求:(1)电源电动势;(2)的阻值;(3)电键断开时,干路上的电流强度。】;主要考察你对闭合电路的欧姆定律等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003342-45518.jpg)
A.小灯泡变亮 | B.小灯泡变暗 |
C.![]() | D.电流表的示数减小 |
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003338-57232.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003333-36599.jpg)
A.A灯变亮 B.A灯变暗 C.B灯变亮 D.B灯变暗
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003322-25457.png)
A.线圈中的感应电流方向为顺时针方向 |
B.电阻R两端的电压随时间均匀增大 |
C.线圈电阻r消耗的功率为4×10-4W |
D.前4s内通过R的电荷量为4×10-4C |
![](http://img.shitiku.com.cn/uploads/allimg/20200114/20200114003317-70122.jpg)
A.p向a移动,V1示数增大、V2的示数减小 |
B.p向b移动,V1示数增大、V2的示数减小 |
C.p向a移动,V1示数改变量的绝对值小于V2示数改变量的绝对值 |
D.p向b移动,V1示数改变量的绝对值大于V2示数改变量的绝对值 |
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