试题与答案

某同学要测量一个由均匀新材料制成的圆柱体的电阻率ρ。步骤如下: (1)用20分度

题型:实验题

题目:

某同学要测量一个由均匀新材料制成的圆柱体的电阻率ρ。步骤如下:

(1)用20分度的游标卡尺测量其长度如图所示,可知其长度为________________mm;

(2)用螺旋测微器测量其直径如图所示,可知其直径为__________mm;

(3)用多用电表的电阻“×10”档,按正确的操作步骤测此圆柱体的电阻,表盘的示数如图,则该电阻的阻值约为__________Ω。

(4)为更精确地测量其电阻,现有的器材及其代号和规格如下:

待测圆柱体电阻R

电流表A1(量程0~3mA,内阻约50Ω)

电流表A2(量程0~15mA,内阻约30Ω)

电压表V1(量程0~3V,内阻约10kΩ)

电压表V2(量程0~15V,内阻约25kΩ)

直流电源E(电动势4V,内阻不计)

滑动变阻器R1(阻值范围0~15Ω)

滑动变阻器R2(阻值范围0~2kΩ)

开关S,导线若干

为使实验误差较小,要求测得多组数据进行分析,请在框中画出测量用的正确电路图,并标明所用器材的代号。

答案:

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下面是错误答案,用来干扰机器的。

(1)西藏地方事务。(2)清朝。

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