题目内容
图1为测量电压表V内阻r的电路原理图.图中两个固定电阻的阻值均为R,S1、S2是开关,E是电源(内阻可忽略)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302573409314.png)
小题1:按电路原理图将图2中的实物图连线;
小题2:开关S1保持断开,合上开关S2,此时电压表的读数为U1;再合上开关S1,电压表的读数变为U2,电压表内阻r=_______(用U1、U2和R表示).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302573409314.png)
小题1:按电路原理图将图2中的实物图连线;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302573872123.png)
小题2:开关S1保持断开,合上开关S2,此时电压表的读数为U1;再合上开关S1,电压表的读数变为U2,电压表内阻r=_______(用U1、U2和R表示).
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130257418394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302574341228.png)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130257465332.png)
小题1:按电路原理图将图2中的实物图连线如下
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302574341228.png)
小题2:根据题意可知,电源电动势为U2,所以有
,计算可得电压表内阻为:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130257574315.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302574341228.png)
小题2:根据题意可知,电源电动势为U2,所以有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130257527947.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130257574315.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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