题目内容
(10分)某同学测量电流表G1内阻r1的电路如图所示,供选择的仪器如下:
①待测电流表G1(0~5mA,内阻约300Ω);
②电流表G2(0~10mA,内阻约100Ω);
③定值电阻R1(300Ω);
④定值电阻R2(10Ω);
⑤滑动变阻器R3(0~1000Ω);
⑥滑动变阻器R4(0~20Ω);
⑦干电池(1. 5V);
⑧电键及导线若干。
(1)定值电阻应选________,滑动变阻器应选________。(在空格内填写序号)
(2)完成实物图连接。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030309574648.jpg)
(3)补全实验步骤:
①按电路图连接电路,将滑动触头移至最________端(填“左”或“右”):
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030309571916.jpg)
②闭合电键,移动滑动触头至某一位置,记录G1、G2的读数I1,I2;
③多次移动滑动触头,记录相应的G1、G2读数I1,I2;
④以I2为纵轴,I1为横轴,做出相应图线,如图所示。
(4)根据I2- I1图线的斜率k及定值电阻,写出待测电流表内阻r1的表达式________。
①待测电流表G1(0~5mA,内阻约300Ω);
②电流表G2(0~10mA,内阻约100Ω);
③定值电阻R1(300Ω);
④定值电阻R2(10Ω);
⑤滑动变阻器R3(0~1000Ω);
⑥滑动变阻器R4(0~20Ω);
⑦干电池(1. 5V);
⑧电键及导线若干。
(1)定值电阻应选________,滑动变阻器应选________。(在空格内填写序号)
(2)完成实物图连接。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030309574648.jpg)
(3)补全实验步骤:
①按电路图连接电路,将滑动触头移至最________端(填“左”或“右”):
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030309571916.jpg)
②闭合电键,移动滑动触头至某一位置,记录G1、G2的读数I1,I2;
③多次移动滑动触头,记录相应的G1、G2读数I1,I2;
④以I2为纵轴,I1为横轴,做出相应图线,如图所示。
(4)根据I2- I1图线的斜率k及定值电阻,写出待测电流表内阻r1的表达式________。
(1)③,⑥ (2)如图(3)①左
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030309886780.jpg)
(4)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031020665.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030309886780.jpg)
(4)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031020665.png)
试题分析:(1)待测电流表
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031020343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031035479.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031020343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031066327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031035479.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031098347.png)
(2)根据电路图连接实物电路图,实物电路图如图所示.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030311136776.jpg)
(3)①按电路图连接电路,将滑动触头移至最左端;
(4)由电路图可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031113941.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031129399.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031144616.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003031160647.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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