![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/ccd030e4-5ada-4d19-838f-b4beda749a79.png?resizew=154)
(1)为了提高电阻丝直径的测量精度,该同学先数出变阻器的总圈数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1355f118e73129889ca6aa1c98406b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d11de0ff22b3a1c6a1a1ecf0b2e1075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)为了测量滑动变阻器电阻丝的电阻率,该同学先用多用电表粗测其总电阻。用已经调零且选择开关指向欧姆挡“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3a1e976dc7ccea4600a8ad1121760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/1548c83a-4eee-41a6-86c2-6b2e5a72bbc7.png?resizew=553)
(3)除待测滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
A.电流表A1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd03792c2bb898cc9effd2dc4036869f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfc94140dbcc45a703b262b37284095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66de503c8055c43644b847eba74b50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947e97835206d91d18ea14b68ed1b031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97609f282c177d4b2bbd48809998aceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0303b4d79507a7b7c1dccaecaebff5ef.png)
B.电压表V1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0c81d3bdfe9dd9fe420c382e8b91c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7594e87e8856772aa0297ff0aef2b522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad53b547e11f3e4719a70a4b9564cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837f3cec443d2a16c18d852450428368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310110dd658431d4207e47286a38fffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14654dff90bd9912cc1ea0945fea0f38.png)
C.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281e8f4804c29190f5535f58d39341a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9d1ce44013cb5ba7c6038dabc2803d.png)
D.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a26d456861dfa59cc8a9226af579d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c327d0f1396ddc8f8a4c1662cd626.png)
E.电阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f1cb5a755695ca159f6a52b0e40e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/475b26520221293f3513968ee8cc694b.png)
F.电源E(电动势
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9e557b18168d9ec84e65fb46057d72.png)
G.开关S一个,导线若干
为了减小实验误差,测量范围尽可能大些,请回答以下问题:
从以上实验器材中选择合适的实验器材,设计测量电阻率的电路图,画在图丙所给的虚线框内,在电路图中标明实验器材的符号
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09855c0f8bc91396fa77ef5b4a6e2ddf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/130f46cbe1e6dfd58f791c7d09a09e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9942091e83e1d59af01f499a0caee212.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/5f163258-225b-4306-9ff3-519b4b208144.png?resizew=500)
相似题推荐
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
(1)用20分度的游标卡尺测量其长度如图甲所示,可知其长度为L=
(2)用螺旋测微器测量其直径如图乙所示,可知其直径为d=
![](https://img.xkw.com/dksih/QBM/2021/8/26/2794418269986816/2794504754864128/STEM/44c70242-2956-4410-b97d-fabc8e362b61.png?resizew=367)
(3)根据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
该电阻的阻值约为2.2×102Ω。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0~15mA,内阻约为30Ω);电流表A2(量程0~3mA,内阻约为50Ω);
电压表V1(量程0~3V,内阻约为10kΩ);电压表V2(量程0~15V,内阻约为25kΩ);
直流电源E(电压为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,请在虚线框中画出正确的电路图,并标明所用器材的代号
![](https://img.xkw.com/dksih/QBM/2021/8/26/2794418269986816/2794504754864128/STEM/3ab31091-7f96-44a0-b5a8-280ebda4b675.png?resizew=176)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b132e0cbd0e446630f4bb65804ce581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e0a6f3b59a4cca5721ec634408d197.png)
A.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fade4e14bf5845ff14f9e95bb6bfef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0c81d3bdfe9dd9fe420c382e8b91c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad53b547e11f3e4719a70a4b9564cc8.png)
B.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40f1d184152aa3954752ed70e7d1612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba17b88bde0d2850642a6a69e565d144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94435abd92f9e157066cfb7f4e1b514.png)
C.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947e97835206d91d18ea14b68ed1b031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159faf4a64cab518863177238d345ff7.png)
D.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd03792c2bb898cc9effd2dc4036869f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d44d033bbc7752424cc86ae17a748e4.png)
E.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c183718f7a66d748ab258ee5ee34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9d1ce44013cb5ba7c6038dabc2803d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/4acc9c94-a0c0-486d-892d-4c834ffd7f5e.png?resizew=381)
(1)为减小测量误差,在实验中,电压表应选用
(2)图2是测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
(3)测量出金属丝直径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
【推荐1】某实验小组的同学探究一种特制合金金属丝的电阻率,步骤如下:
(1)用螺旋测微器测量其直径如图,由图可知其直径为
(2)用多用电表欧姆挡粗略测量此合金金属丝(长度为)的电阻,所选倍率挡为
挡,操作步骤正确,发现表头指针偏转角度过小,为了较准确地进行测量,应换到
。
(3)该小组同学想用伏安法更精确地测量其电阻,现有的器材及其代号和规格如下:
现有电源(3V,内阻约)、滑动变阻器(
)、开关和导线若干,以及下列电表:
A.电流表(,内阻约
)
B.电流表(,内阻约
)
C.电压表(,内阻约
)
D.电压表(,内阻约
)
①为减小测量误差,在实验中,电压表应选用
②下图是测量的实验器材实物图,图中已连接了部分导线。请根据你设计的合理电路图,补充完成实物间的连线
③测量出合金金属丝直径为、长度为
,电压表示数为
,电流表示数为
,则该金属丝电阻率测量值的表达式
(1)用刻度尺量出圆柱体长度为L,用螺旋测微器测出其直径d 如图所示,则d=
![](https://img.xkw.com/dksih/QBM/2017/12/29/1848811826880512/1850417399119872/STEM/78fb2a0ae35f48e38c1fa3360218fe11.png?resizew=217)
(2)(多选)若用多用电表的欧姆挡粗测圆柱体的电阻.机械调零、欧姆调零后,选择“×100”倍率进行测量,发现表针偏转角度很大,正确的判断和做法是
A.被测电阻值很大
B.被测电阻值很小
C.为了把电阻值测得更准一些,应换用“×1k”挡,重新欧姆调零后再测量
D.为了把电阻值测得更准一些,应换用“×10”挡,重新欧姆调零后再测量.
(3)现选择多用电表的电阻“×10”挡,按正确的操作步骤测此圆柱体的电阻,表盘的示数如图,则该电阻的阻值约为R=
![](https://img.xkw.com/dksih/QBM/2017/12/29/1848811826880512/1850417399119872/STEM/6e7d67241947410caa537b293244abc2.png?resizew=284)
(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
电流表A1(量程0~4mA,内阻约50Ω); 电流表A2(量程0~10mA,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,允许通过的最大电流2.0A)
滑动变阻器R2(阻值范围0~2kΩ,允许通过的最大电流0.5A)
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,请在图框中画出测量的电路图,并标明所用器材的代号
![](https://img.xkw.com/dksih/QBM/2017/12/29/1848811826880512/1850417399119872/STEM/d427b6d13e0640388f6b3bb1d0c1d5df.png?resizew=150)
(5)根据测得量求出圆柱体材料的电阻率表达式
(1)甲同学想利用多用电表的欧姆挡测量电流表的内阻,为了电表安全,测量时应将红表笔接触电流表的
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/b9eb573d-afa6-4812-8f6e-cee1783031c1.png?resizew=279)
(2)乙同学想利用图b所示电路测量电流表的内阻,请在图c中用笔画线代替导线完善实物图连线
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/246b80a2-f7f8-48a5-80ae-cb639271a302.png?resizew=324)
(3)为了使测量时相对误差更小,要求测量时两电表指针偏转均超过其量程的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2021/2/5/2651710985469952/2652091451490304/STEM/f8a40be1-3d44-421e-a729-b86a4bfd5e31.png?resizew=368)
他选择“×100”倍率的欧姆挡按照正确的步骤测量未知电阻时,发现表针偏转角度很大,如图1中虚线①的位置所示,为了能获得更准确的测量数据,他应该将倍率调整到
(1)分别用刻度尺和游标卡尺测出其长度L和外径d,其中d的某次读数为10.30mm,则使用的测量仪器与以下哪种一致
A.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/a0bb3661-6029-468a-ba0d-11ec283fc3d8.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/8c84ac30-8b02-4d33-bee7-89934048e91a.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/bb361e06-e3ca-455b-9c98-c87813589e51.png?resizew=178)
(2)用多用电表粗测液体柱的阻值R,多用电表测量情况如图所示,为了更准确的测出液体柱的阻值,下列操作正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/7fc0fcf9-e80a-473f-912a-2331d7a09a15.png?resizew=210)
A.将选择开关旋转到电阻挡“×10”的位置,两表笔短接调零,再次测量电阻
B.将选择开关旋转到电阻挡“×1k”的位置,两表笔短接调零,再次测量电阻
C.将两表笔短接调零,再将选择开关旋转到电阻挡“×10”的位置,再次测量电阻
D.将两表笔短接调零,再将选择开关旋转到电阻挡“×1k”的位置,再次测量电阻
(3)该小组为进一步精确测量液体柱的阻值,选择了如下实验器材:
A.直流电源:电动势12V,内阻不计,额定电流为1A;
B.电流表 A:量程0~10mA,内阻约10Ω;
C.电压表 V:量程0~15V,内阻约15kΩ;
D.滑动变阻器R:最大阻值10Ω;
E.开关、导线等
为多次测量数据,该小组采用分压电路进行测量,请在实物接线图中完成余下导线的连接
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/4c814c79-77ee-4ec3-b710-a981b2471f40.png?resizew=250)
(4)实验时,闭合开关S前,滑动变阻器的滑片P应处在
(5)该小组在实验中测得电压表和电流表的示数分别为U和I,则海水电阻率表达式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)