实验题 较易0.85 引用1 组卷313
某同学要测量均匀新材料制成的圆柱体的电阻率,步骤如下:
(1)用游标卡尺测量其长度如图甲所示,由图可知其长度为L___________ cm。
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/99cb575a-83ee-4b5b-b9fc-e7e4a52fc246.png?resizew=272)
(2)用螺旋测微器测量其直径如图乙所示,由图可知其直径D=___________ mm。
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/3bbabf8a-0406-473d-b5fb-2d94dbf91aac.png?resizew=169)
(3)用多用电表的电阻“×10”挡,按正确的操作步骤测此圆柱体的电阻,表盘示数如图丙所示,则该电阻的阻值约为___________ 。
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/f8258212-529c-4c65-8ea2-dfa222c19abb.png?resizew=448)
(4)该同学想用伏安法更精确地测量其电阻R,现有的器材及其代号和规格如下:
待测圆柱体电阻R;开关S;导线若干;电流表A(量程0~30mA,内阻约30);电压表V(量程0~3V,内阻约10k);直流电源E(电动势4V,内阻不计);滑动变阻器R1(阻值范围015,允许通过的最大电流2.0A)。
为减小测量误差,在实验中实验电路应采用图中的___________ ,但用此电路图测得的电阻值___________ 真实值(填“大于”“等于”或“小于”)。
A.
B.
C.
D.![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/82f0ddab-f2bb-41b3-8c81-fbfdcefe48c0.png?resizew=141)
(1)用游标卡尺测量其长度如图甲所示,由图可知其长度为L
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/99cb575a-83ee-4b5b-b9fc-e7e4a52fc246.png?resizew=272)
(2)用螺旋测微器测量其直径如图乙所示,由图可知其直径D=
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/3bbabf8a-0406-473d-b5fb-2d94dbf91aac.png?resizew=169)
(3)用多用电表的电阻“×10”挡,按正确的操作步骤测此圆柱体的电阻,表盘示数如图丙所示,则该电阻的阻值约为
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/f8258212-529c-4c65-8ea2-dfa222c19abb.png?resizew=448)
(4)该同学想用伏安法更精确地测量其电阻R,现有的器材及其代号和规格如下:
待测圆柱体电阻R;开关S;导线若干;电流表A(量程0~30mA,内阻约30);电压表V(量程0~3V,内阻约10k);直流电源E(电动势4V,内阻不计);滑动变阻器R1(阻值范围015,允许通过的最大电流2.0A)。
为减小测量误差,在实验中实验电路应采用图中的
A.
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/3d3e2545-dbdd-4b73-afb0-654e684fb5c3.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/0d0cd59c-737a-40b6-afca-c8ac3ca97bb6.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/9f7e3d83-a5eb-42b7-8daa-518bc42e815d.png?resizew=140)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851807523373056/2853110035734528/STEM/82f0ddab-f2bb-41b3-8c81-fbfdcefe48c0.png?resizew=141)
21-22高二上·山东·期中
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