题目内容
(12分)某同学要测量一个由均匀新材料制成的圆柱体的电阻率P。步骤如下:
①游标卡尺测量其长度如图甲所示,可知其长度为mm;
②用螺旋测微器测量其直径如图乙所示,可知其直径为mm;
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040240087682.jpg)
③选用多用电表的电阻“×1”挡,按正确的操作步骤测此圆柱体的电阻,表盘的示数如图所示,则该电阻的阻值约为
;
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500402403925926.jpg)
④为更精确地测量其电阻,可供选择的器材如下:
电流表A1(量程300mA,内阻约为2
);
电流表A2(量程l50mA,内阻约为10
);
电压表V1(量程lV,内阻r=1000
);
电压表V2(量程l5V,内阻约为3000
);
定值电阻R0=1000
;
滑动变阻器R1(最大阻值5
);
滑动变阻器R2(最大阻值l000
);
电源E(电动势约为4V,内阻r约为1
);
开关,导线若干。
为了使测量尽量准确,测量时电表读数不得小于其量程的
,电压表应选,电流表应选,滑动变阻器应选。(均填器材代号)
根据你选择的器材,请在线框内画出实验电路图。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040244766502.jpg)
①游标卡尺测量其长度如图甲所示,可知其长度为mm;
②用螺旋测微器测量其直径如图乙所示,可知其直径为mm;
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040240087682.jpg)
③选用多用电表的电阻“×1”挡,按正确的操作步骤测此圆柱体的电阻,表盘的示数如图所示,则该电阻的阻值约为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500402403925926.jpg)
④为更精确地测量其电阻,可供选择的器材如下:
电流表A1(量程300mA,内阻约为2
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
电流表A2(量程l50mA,内阻约为10
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
电压表V1(量程lV,内阻r=1000
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
电压表V2(量程l5V,内阻约为3000
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
定值电阻R0=1000
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
滑动变阻器R1(最大阻值5
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
滑动变阻器R2(最大阻值l000
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
电源E(电动势约为4V,内阻r约为1
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
开关,导线若干。
为了使测量尽量准确,测量时电表读数不得小于其量程的
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024460327.png)
根据你选择的器材,请在线框内画出实验电路图。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040244766502.jpg)
①50.15(1分) ②4.700(4.698
4.702)(1分) ③22(1分)
④
(每空2分)电路如图所示![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040247882446.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024523185.png)
④
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024538344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024569354.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024725327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040247882446.jpg)
试题分析:①50+3×0.05=50.15mm;②4.5+0.01×20.0=4.700mm;③多用电表读数22×1=22
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024460327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024538344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024538344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024023333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024569354.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004024725327.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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