![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/36def167-5c2b-4dc6-9a8a-6021fe35f623.png?resizew=123)
(2)某同学用指针式多用电表粗略测金属丝的阻值。他将红黑表笔分别插入“+”、“-”插孔中,将选择开关置于“×10”档位置,然后将红、黑表笔短接调零,此后测量阻值时发现指针偏转角度较小。试问:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/ea13eef2-b735-4ac2-8c4d-162bc7033242.png?resizew=404)
①为减小实验误差,该同学应将选择开关置于“
②再将红、黑表笔短接,重新调零后继续实验,结果看到指针指在如图所示位置,则金属丝电阻的测量值为
A.待测金属丝R(电阻约8Ω)
B.电流表A(0.6A,内阻约0.6Ω)
C.电压表V(3V,内阻约3kΩ)
D.滑动变阻器R1(0-5Ω,2A)
E.电源E(6V)
F.开关,导线若干
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/0ddb6942-b507-4e70-b1a4-cd9a305e4501.png?resizew=306)
(1)某同学用螺旋测微器和游标卡尺分别测量金属丝的直径和长度,读出图中的示数,图甲为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)某同学采用如图所示电路进行实验,请用笔画线代替导线,在图中将实物电路图连接完整
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/d836b583-51f8-4875-92be-9d20505d6321.png?resizew=296)
(3)测得金属丝的直径为d,改变金属夹P的位置,测得多组金属丝接入电路的长度
![](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/4ae9d3c8382cf73eaf3c21edabd5984f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/e1a3f1c1-adbb-4ce8-9a9e-04ad7a3568f8.png?resizew=147)
(4)关于电阻率的测量,下列说法中正确的有
A.开关
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3482b3e788f6069d41ee5a190c7ef1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
B.实验中,滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
C.待测金属丝
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
D.该实验方案中电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
A.电压表V(量程0~3V,内阻约为3.0kΩ)
B.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6506491c2df182cc966a8b1102b015ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f646ea3a7ee49fd0689449b59266e197.png)
C.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
D.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23535abf675623a04db5061602817b22.png)
E.滑动变阻器R(0~5Ω,允许通过的最大电流为2A)
F.干电池组(电动势为6V,内阻约为0.05Ω)
G.一个开关和导线若干
H.螺旋测微器,游标卡尺
(1)用多用电表粗测金属棒的阻值:当用“×10Ω”挡时发现指针偏转角度过大,他应该换用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e42daf013b23b94a9cbe3bff96fa61e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/47874332-4b9b-4fd0-a390-bb97ffcc6c46.png?resizew=467)
(2)请根据提供的器材,设计一个实验电路,要求各电表的示数超过满刻度的一半,尽可能精确测量金属棒的阻值,请在图乙所示的虚线方框中画出电路图
(3)若实验测得电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33644b5e97690736f6a242ef7b13d08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910f1655703721b51006b887a2394b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779629f16056a50f4c06e3996d8e1c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
(1)实验时,闭合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910f1655703721b51006b887a2394b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(2)实验时,闭合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910f1655703721b51006b887a2394b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779629f16056a50f4c06e3996d8e1c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779629f16056a50f4c06e3996d8e1c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58190e2cb64c3ee2f73a1a43624cec6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/2b292e60-d416-4bbd-99fc-e721739b2148.png?resizew=595)
(3)修复故障后,用电流表内接法测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779629f16056a50f4c06e3996d8e1c82.png)
(4)用电流表内、外接法得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408033e0032eed4c84707a55733c66a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36f18134dcb18d50ba0c8544243f2f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe9f7abf7bcf4e1aa2579cd191d7761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e5301d7c98f519688e410846bf918f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/7b6e3851-f1de-4738-b05d-908b82d0098d.png?resizew=247)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/1/5f7498e4-b9b1-4b3a-ac8e-7dcc97a5ea77.png?resizew=131)
(1)用图甲(a)中的螺旋测微器测量电阻丝的直径d。先将电阻丝轻轻地夹在测砧与测微螺杆之间,当测微螺杆快接近电阻丝时,再旋转
(2)用图乙所示电路图测量电阻丝的电阻Rx,其中R0为一定值电阻。请用笔画线代替导线,把图丙中的实物电路补充完整
![](https://img.xkw.com/dksih/QBM/2023/4/28/3226031125913600/3226070343966720/STEM/d8881d8bb8544ac3ae01d0c82f0682db.png?resizew=535)
(3)第一次按图乙所示的电路测量,调节滑动变阻器的滑片,测得多组电压U及电流I的值;第二次将电压表改接在a、b两点测量,测得多组电压U及电流I的值,并作出如图丁所示的U-I图像。则第一次测量得到的图线是
![](https://img.xkw.com/dksih/QBM/2023/4/28/3226031125913600/3226070343966720/STEM/9c057191a9794cd19240f8bc44a9ef2b.png?resizew=278)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/b14d2410-df46-4b8e-b4d9-55a424bcb506.png?resizew=426)
(1)圆柱体的直径为
(2)已知实验中所用的滑动变阻器阻值范围为0~10Ω,电流表内阻约几欧,电压表内阻约20kΩ。电源为干电池(不宜在长时间、大功率状况下使用),电动势E=4.5V,内阻很小。则以下电路图中
A.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/e50cb0ad-3e6a-4c21-bd8f-e4640c5989f0.png?resizew=156)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/92fd3913-68f2-42c2-8d6b-a1431acd0ab1.png?resizew=155)
C.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/82e22b56-edb5-4c90-b78c-7f07bfc46781.png?resizew=144)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/f5fe42a1-1553-4c77-963e-3fc2c0d5c2c3.png?resizew=137)
(3)若流经金属丝的电流为I,圆柱体两端之间的电压为U,圆柱体的直径和长度分别为D、L,测得D、L、I、U表示的电阻率的关系式为ρ=
7 . 实验小组测量某弹性导电绳的电阻率。实验过程如下:
装置安装和电路连接。如图(a)所示,导电绳的一端固定,另一端作为拉伸端,两端分别用带有金属夹A、B的导线接入如图(b)所示的电路中。先闭合开关S1、S2,调节R,使电压表和电流表的指针偏转到合适的位置,记录两表的示数U0和I0。
(1)然后断开开关S2,电流表的示数
(2)多次拉伸导电绳,每次都测量并记录AB间的距离L和导电绳横截面积S,调节滑动变阻器R的滑片的位置,使电流表的示数为I0,记下此时的电压表示数U。绘制如图(c)所示的图像。已知图线的斜率为k、与纵轴的截距为d,则弹性导电绳的电阻率ρ==
(3)若考虑电流表的内阻,则(2)中的电阻率的测量值
A.电池组(3V,内阻1Ω)
B.电流表(0~3A,内阻约0.0125Ω)
C.电流表(0~0.6A,内阻约0.125Ω)
D.电压表(0~3V,内阻约3kΩ)
E.电压表(0~15V,内阻约15kΩ)
F.滑动变阻器(0~20Ω,额定电流1A)
G.滑动变阻器(0~2000Ω,额定电流0.3A)
H.开关、导线
(1)上述器材中应选用的是
(2)设实验中,电流表电压表的某组示数如下图所示,图示中I=
![](https://img.xkw.com/dksih/QBM/2023/3/26/3202954308673536/3203457751474176/STEM/01dc0c2c371344aca2072a19b2c3b564.png?resizew=363)
(3)为使通过待测金属导线的电流能在0~0.5A范围内改变,电流表应采用
![](https://img.xkw.com/dksih/QBM/2023/3/26/3202954308673536/3203457751474176/STEM/898891263cf8440f87d1a3988e3dc82f.png?resizew=288)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/ff2455da-6ff6-469a-9ac0-788db779bded.png?resizew=260)
电源:电压为3V;
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf35aa115963656d885b6440d6caa2c.png)
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
电压表V:0~3V量程,内阻约为3kΩ;
滑动变阻器:最大阻值为5Ω;
待测镍铬合金丝:电阻约为10Ω;
一个开关,导线若干。
(1)为了尽可能准确地进行测量,电流表应该选择
(2)要求尽可能测量多组数据,请按照要求完成实物图的连接
(3)开关闭合前,滑动变阻器的滑片应该置于
(1)该实验小组用刻度尺测量其长度L、螺旋测微器测量其直径D,某次直径测量结果如图所示:D=
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/e2d7817a-e560-4196-899d-a43fdeea698e.png?resizew=194)
(2)实验使用的滑动变阻器的阻值为0~20Ω,请将如图实际测量电路补充完整
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/26/e094ef6f-e97c-4754-b122-3308f4d1a3e1.png?resizew=259)
(3)闭合开关前,滑动变阻器的滑片应置于
(4)某次实验时,电压表的示数为U,电流表的示数为I,用实验测量的物理量L、D、U、I表示电阻率,则表达式为ρ=