A.待测金属丝(电阻约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d757a8853133814c9a9753443c1cf82.png)
B.毫米刻度尺
C.螺旋测微器
D.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5c929172bbfc21741fa7ef1f53b7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66de503c8055c43644b847eba74b50f.png)
E.毫安表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c7e03eed3469e3120060aa375fc327e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7705c06f3cc7f6843796ba83d7c83a77.png)
F.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49f183a0b52a360faa425b974e177926.png)
G.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b49bd50cc6fc1307c907c8e5bc953de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9d1ce44013cb5ba7c6038dabc2803d.png)
H.蓄电池(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3088c2099211295de775ee33dd1d03fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6699c896d7394a071917fe3922f3864f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.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/a5185fded87ce33ee96df3ad4311d6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f736ab50f65b22270093ab541afe9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3ef4881bd7c5860178dbdbc7bba6e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4321442a6c03fbdac49f6a94b8d78b.png)
(1)用螺旋测微器测量该圆柱体的直径,示数如图1所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55519bd96aba05e6f1533ddc7bb63fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3a1e976dc7ccea4600a8ad1121760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eebdb972b35aaa81a6662aaf8db1c282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
(3)为精确测量该圆柱体电阻的大小,实验小组设计了如图3所示的实验电路图,实验室提供了如下器材:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b26d0e154ef213ebe194b8b5e519f13.png)
B.电流表A1(量程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b1869f175cb97a02fa01b5cc6951f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d34a0b9cef46caaa59e64fa49cdbda4.png)
C.电流表A2(量程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c11418c37ce03c536138a6bdc0816c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78aa8e890d2ac882e0fe79598811777a.png)
D.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b0b1d4ec26a22535d296b949b074ea8.png)
E.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78aa8e890d2ac882e0fe79598811777a.png)
F.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba93a05f0c780e64378f5e6361a9dad.png)
请回答下列问题:
a.实验中,乙表应选
![](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/67c1313842b62428737610b14806d883.png)
b.
![](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/e8bf2607ac031a6f6c5ec503b3f32b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951ae19f5f869505556202320d888f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(4)仅从系统误差的角度考虑,本次实验电阻率的测量值
(1)技术人员用游标卡尺测量塑料管的内径,读数如图乙,则塑料管的内径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/48f3f556-9dc1-4fcf-acfa-992f175fb4c1.png?resizew=652)
(2)技术人员用图丙所示电路来测量水样的电阻率,方法如下:
①调整电阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
②改变管中水柱长度,重复步骤①,得到多组R、L值;
③根据测得数据,以管中水柱长度L为横轴,以电阻箱读数R为纵轴,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1743ba519b6c1f659074175d2412c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164932c352061abf01e7e3513b08229d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19e45f1e706fb6d0835a69a34e6f442.png)
(3)测中,当塑料管中水柱的长度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d723bc079fd8c07d680f67699a1f789.png)
(4)本实验中灵敏电流表的内阻Rg对实验结果
(5)本实验在操作中,如果发现在调整电阻箱R的阻值时灵敏电流表不能达到满偏,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2d4775108dbaaf447c51fe18b088c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71cc6c8839f29a02ae5289acf03f2c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b44014883510d3933bf20d66f44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11d69118d4c8965597a9cca909eeac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b132e0cbd0e446630f4bb65804ce581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaab27d71cd1a342f454c8853e69e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6adf018661822b7ec8e0d70579a21bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/b3a18ba5-9794-4337-bcee-863ed7432467.png?resizew=483)
(1)用图甲中的螺旋测微器测量直径时,将电阻丝放在测砧与测微螺杆之间,先旋动__________,当测微螺杆快靠近物体时,再旋动__________,直到听见“喀喀”的声音,再扳动__________并读数。上述操作选择的部位依次是
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
测量结果如图乙所示,直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
(2)请将电路实物连线补充完整
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/7/7a7f7a14-b23b-448d-bba6-3e67d272a039.png?resizew=177)
(3)闭合开关前,滑动变阻器的滑片应置于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.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/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.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)
(4)不考虑偶然误差,通过该实验测得的电阻率
5 . 某同学查阅资料后发现,金属丝的电阻率ρ随温度变化的规律为ρ=ρ0(1+αt),其中α称为电阻温度系数,ρ0是金属丝在t=0℃时的电阻率。该同学利用实验室中的器材测定某种金属丝的电阻温度系数。实验的主要步骤如下:
a.将满偏电流Ig=120mA、内阻rg=2.0Ω的灵敏电流计并联一电阻R,改装成量程为0.6A的电流表;
b.用螺旋测微器测量金属丝的直径;
c.将金属丝接入如图甲所示的电路中,用米尺测量金属丝接入电路中的有效长度;
d.闭合电键,调节滑动变阻器滑片的位置,测量金属丝的温度并记下电压表及灵敏电流计的多组示数;
e.改变金属丝的温度,重复实验;
f.算出不同温度下金属丝的电阻率,将电阻率与温度的数据在坐标纸中描出点迹,如图乙所示。
请回答以下问题:
(1)R=
(2)某次测量螺旋测微器的读数如图丙所示,则读数为
(3)某次实验中,电压表的示数为2V,灵敏电流计的示数为100mA,则金属丝的电阻为
(4)该金属丝的电阻温度系数α=
(1)使用螺旋测微器测定金属丝直径d,某次测量结果如图甲所示,读数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55519bd96aba05e6f1533ddc7bb63fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
(3)用伏安法测圆柱体电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
电池组E:电动势
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b26d0e154ef213ebe194b8b5e519f13.png)
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82d0a391ecfedee321c690f9eedd994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e278c32ede0c61f56cb6c0dc50dc29.png)
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/145fe3b264d643c385708d791df43ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d73e3afd9125734e380b2fe53d0f258.png)
滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b44014883510d3933bf20d66f44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6699c896d7394a071917fe3922f3864f.png)
电阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f4e10201bbc6ee6c9afeb95860c8973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c327d0f1396ddc8f8a4c1662cd626.png)
开关S,导线若干。
要求实验中尽可能准确地测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
①为了测量待测电阻两端的电压,将电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb7ac77f991411f94235ae5a4fca19b.png)
②在方框中画出测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1487858ca25b9de96d3aa12232c0c0a.png)
A.电池组(电动势
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e0a6f3b59a4cca5721ec634408d197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db144c76e36b0c4d950698b2bbc39f9.png)
B.电流表(量程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11d69118d4c8965597a9cca909eeac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47367bf5c848198638bc6d92ebe37262.png)
C.电流表(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9d332743ec267382cd99600b757cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d446865b9ad8655c7450527d3315f8fc.png)
D.电压表(量程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6bb65878785532d817f8fd11a9ef3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951f5dfc2ee88b950c0a4322d9236ce4.png)
E.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fe7f473a67ee2367ffbd8bec067b44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e7fa07e4fbe9f7f5ef712e1246d970.png)
F.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8a3777696e4085a11748eaec4c3497f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fd4d30b27a9f75cae20916d5744baa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/29/e8297411-a274-4aa6-8a8f-b676a8dcd317.png?resizew=197)
(1)某同学用螺旋测微器测量金属丝直径如图所示,该金属丝的直径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)为了获得多组数据,尽量精确测量待测金属丝的电阻值,电流表应选
(3)若测得金属丝的直径用d表示,金属丝的长度用L表示,电阻用R表示,则该金属丝的电阻率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9311b3cef335848b7f11ad163e4ed959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
①量程为3V、内阻约为3kΩ的电压表V;
②量程为0.6A、内阻约为0.1Ω的电流表A;
③阻值为0~5Ω的滑动变阻器 R;
④内阻较小, 电动势为3V 的电源 E;
⑤阻值为4.50Ω的定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be09a84eacb16b84bdd27bae20744a46.png)
⑥开关和导线若干。
(1) 用螺旋测微器测量铜电线的直径,示数如图所示, 则铜电线的直径为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/2a4fb37a-0ee9-45fa-8453-b8728ae67e12.png?resizew=221)
(2) 请帮小明同学设计实验电路, 将电路图画到方框内,并标明各器材的符号
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/f2ee67bd-3959-49ec-ba1d-c67b21acf7c1.png?resizew=307)
(3) 正确测量后得到若干数据,在坐标纸上做出 U-I图像,由图像结合已知数据测得电线长度为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/bca48b1d-4e82-4e61-9a7c-dfa2b625b1d8.png?resizew=372)
(4) 再三检查上述仪表及实验操作均没有问题后,他又用其它方法准确测出该捆电线的实际长度是100m,导致本次测量偏差较大可能是
A. 实验存在系统误差,电阻的测量值偏大
B. 铜导线含有杂质,导线的电阻率比纯铜的大
C. 直径的测量值比实际值偏小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20321c69d95af5e5a3adc104975a9a6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/bc18569d-9b97-480e-8252-67c1614ea0a4.png?resizew=244)
(1)已知圆柱形容器长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc7bacfe48c818b86c8e9e6cf220130f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eebdb972b35aaa81a6662aaf8db1c282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/d87d602d-ab90-4169-b203-5760c3bba024.png?resizew=409)
(2)为更精确地测量所取水样的电阻,该小组从实验室中找到如下实验器材:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/1f101583-09ec-4fce-8457-dad7e1e7342c.png?resizew=189)
A.电流表(量程5mA,电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e2e08ea32328687eadf15238b4a349.png)
B.电压表(量程15V,电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0332f2e7a24a65c5010ebfde8d20de7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c5ae75672f958823c1fde935be7bea.png)
C.滑动变阻器(0~200,额定电流1A)
D.电源(12V,内阻约
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d757a8853133814c9a9753443c1cf82.png)
E.开关一只、导线若干
请在实物图中完成电路连接
(3)正确连接电路后,闭合开关,测得一组U、I数据;再调节滑动变阻器,重复上述测量步骤,测出一系列数据如下表所示,并作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e43cca5751eff3d24b64cb51006d6d7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/0763b85f-2fc1-4aff-a24d-db331b0842c9.png?resizew=201)
1 | 2 | 3 | 4 | 5 | 6 | |
U/V | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
I/mA | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9942091e83e1d59af01f499a0caee212.png)
(1)实验仪器的使用。用螺旋测微器测量电阻丝的直径,示数如图所示。则该电阻丝的直径为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/326de81e-df35-4c6c-b5fd-edccb0298251.png?resizew=138)
(2)实验仪器的选取。如图甲所示为用伏安法测量某合金丝电阻的实验电路。实验中分别用最大阻值是5Ω、50Ω、500Ω的三种滑动变阻器做限流电阻。当滑动变阻器的滑片由一端向另一端移动的过程中,根据实验数据,分别作出电流表读数I随
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997cd53092cc5e199a7e418dfc46a7a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997cd53092cc5e199a7e418dfc46a7a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/f3b12e41-35b9-49b6-a6aa-3dead8a22eb3.png?resizew=366)
A.最大阻值为5Ω的滑动变阻器;图线a对应的滑动变阻器
B.最大阻值为50Ω的滑动变阻器;图线b对应的滑动变阻器
C.最大阻值为500Ω的滑动变阻器;图线b对应的滑动变阻器
D.最大阻值为500Ω的滑动变阻器;图线c对应的滑动变阻器
(3)实验操作。一多用电表表盘上的电阻刻度线正中间标有“15”字样。用它测量约20kΩ电阻的阻值,下列实验步骤正确的操作顺序为
A.将选择开关置于“×1k”位置
B.将选择开关置于“OFF”位置
C.将两表笔分别接触待测电阻两端,读出其阻值后随即断开
D.将两表笔直接接触,调节欧姆调零旋钮,使指针指向“0”
(4)误差分析。用(2)图甲所示的电路测量一段金属丝的电阻。不考虑偶然误差,测量值与真实值相比较将