有一根细而均匀的圆柱体导体棒样品(如图甲所示),电阻约为
,为了测量其电阻率
,可先测其电阻
,现提供以下实验器材:
![](https://img.xkw.com/dksih/QBM/2021/1/9/2632363871346688/2632566035062784/STEM/57097043-8316-4cfa-85a1-152ca726d1ec.png)
![](https://img.xkw.com/dksih/QBM/2021/1/9/2632363871346688/2632566035062784/STEM/56af6404-ccdf-46bf-abff-dcc05d5cfdb0.png)
A.10分度的游标卡尺
B.螺旋测微器
C.电流表
(量程
,内阻
为
)
D.电流表
(量程
,内阻
约为
)
E.电流表
(量程
,内阻
约为
)
F.滑动变阻器
(
,额定电流
)
G.滑动变阻器
(
,额定电流
)
H.直流电源E(
,内阻不计)
I.圆柱体导体棒样品
(电阻
约为
)
J.开关一只,导线若干
(1)用游标卡尺测得该样品的长度如图乙所示,其示数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1846e964fd60c54888a3c706a97442.png)
___________
;用螺旋测微器测得该样品的直径如图丙所示,其示数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
___________ ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)为了尽可能精确地测量原件电阻
,电路原理图如图,图中甲电流表应选___________ ;乙电流表应选___________ 。(选填C、D、E)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68675459243159bc0ab19eb2e16b2b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://img.xkw.com/dksih/QBM/2021/1/9/2632363871346688/2632566035062784/STEM/57097043-8316-4cfa-85a1-152ca726d1ec.png)
![](https://img.xkw.com/dksih/QBM/2021/1/9/2632363871346688/2632566035062784/STEM/56af6404-ccdf-46bf-abff-dcc05d5cfdb0.png)
A.10分度的游标卡尺
B.螺旋测微器
C.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103aa9c8f5d10a9714fefea533c4a308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad703f4cf8726497968048198fc3517.png)
D.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469015d5fd7b688977dbd268cd930a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bdc68d2f849ba231ec365c3e479a7d.png)
E.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f1eb87ce12491e171c43b238a6ecf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c327d0f1396ddc8f8a4c1662cd626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2cb48c0a69b8c420c0b64b2bfa1ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd4cca063ef0d34192502bdc59208bf.png)
F.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b194498ca323c03e11fd3f531897c2c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c327d0f1396ddc8f8a4c1662cd626.png)
G.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6ca9516545a8bafc04f28e2de41989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572c420017553eab82e08f02e93882c9.png)
H.直流电源E(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9e557b18168d9ec84e65fb46057d72.png)
I.圆柱体导体棒样品
![](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/68675459243159bc0ab19eb2e16b2b5b.png)
J.开关一只,导线若干
(1)用游标卡尺测得该样品的长度如图乙所示,其示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1846e964fd60c54888a3c706a97442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)为了尽可能精确地测量原件电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
更新时间:2021-01-20 20:31:27
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【推荐1】电阻丝有效长度的测量
用______ 测量电阻丝______ 的有效长度l。反复测量多次,得到有效长度的平均值。
用
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【推荐2】在“测定金属的电阻率”的实验中,待测金属导线的电阻Rx约为5Ω。实验室备有下列实验器材:
A.电压表V1(量程3V,内阻约为15kΩ)
B.电压表V2(量程15V,内阻约为75kΩ)
C.电流表A1(量程3A,内阻约为0.2Ω)
D.电流表A2(量程600mA,内阻约为1Ω)
E.变阻器R1(0~10Ω,1A)
F.变阻器R2(0~2000Ω,0.1A)
G.电池E(电动势为3V,内阻约为0.3Ω)
H.开关S,导线若干
(1)要求较准确地测出其阻值,电压表应选_________ ,电流表应选__________ ,滑动变阻器应选____________ 。(用器材前的字母表示即可)
(2)为了减小实验误差,应选用图中______ (选填“a”或“b”)为该实验的电路图。
A.电压表V1(量程3V,内阻约为15kΩ)
B.电压表V2(量程15V,内阻约为75kΩ)
C.电流表A1(量程3A,内阻约为0.2Ω)
D.电流表A2(量程600mA,内阻约为1Ω)
E.变阻器R1(0~10Ω,1A)
F.变阻器R2(0~2000Ω,0.1A)
G.电池E(电动势为3V,内阻约为0.3Ω)
H.开关S,导线若干
(1)要求较准确地测出其阻值,电压表应选
(2)为了减小实验误差,应选用图中
![](https://img.xkw.com/dksih/QBM/2021/5/28/2737914703650816/2738066402508800/STEM/eaa80fe0-8613-4e75-8bdf-c0b74cc1312e.png?resizew=357)
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【推荐3】某同学想设计一个测量金属棒电阻率的实验方案,实验室提供的器材有:
A.电流表
(内阻
,满偏电流
)
B.电流表
(内阻约为
,量程为
)
C.定值电阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcdcccec88b2c96dd1bd688e445584bf.png)
D.滑动变阻器![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88876099c312aee35af0e970a1daa55b.png)
E.干电池组![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce59bb5a9fb53f208400830d97a3ee9d.png)
F.一个开关和导线若干
G.螺旋测微器,游标卡尺
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877435588165632/2878924841451520/STEM/af8efd06-8144-496a-8be9-3890066d8c9a.png?resizew=403)
(1)如图,用螺旋测微器测金属棒直径为________
:如图用游标卡尺测金属棒长为________
.
(2)用多用电表粗测金属棒的阻值:当用“
”挡时发现指针偏转角度过大,他应该换用________ 挡(填“
”或“
”),换挡并进行一系列正确操作后,指针静止时如图甲所示,则金属棒阻值约为________
.
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877435588165632/2878924841451520/STEM/f91d62f1-2886-42e0-b4b3-2e9acdced6de.png?resizew=443)
(3)根据提供的器材,为了尽可能精确测量金属棒的阻值,设计出电路图如图乙所示.若实验测得电流表
示数为
,电流表
示数为
,则金属棒电阻的符号表达式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.png)
________ (用
,
,
,
表示)
A.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c27bd32b0b9c38a676c48924094561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6090e3ae7e90b6a62b409e37c211bd85.png)
B.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd388f2e00bea45ac34903e4ffdfc1b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db586f2c37b26089713ff02346e6d0d8.png)
C.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcdcccec88b2c96dd1bd688e445584bf.png)
D.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88876099c312aee35af0e970a1daa55b.png)
E.干电池组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce59bb5a9fb53f208400830d97a3ee9d.png)
F.一个开关和导线若干
G.螺旋测微器,游标卡尺
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877435588165632/2878924841451520/STEM/af8efd06-8144-496a-8be9-3890066d8c9a.png?resizew=403)
(1)如图,用螺旋测微器测金属棒直径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)用多用电表粗测金属棒的阻值:当用“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7be0f24a17927429ba1b76e0da01be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a14f9891a7937e9e46ee118a68ec9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9d50bc0764f0464471dd6bcbf90c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877435588165632/2878924841451520/STEM/f91d62f1-2886-42e0-b4b3-2e9acdced6de.png?resizew=443)
(3)根据提供的器材,为了尽可能精确测量金属棒的阻值,设计出电路图如图乙所示.若实验测得电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c1313842b62428737610b14806d883.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/9d784ac902fe86e7bdcdd3fa5cc3ba83.png)
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【推荐1】某同学学习多用电表的使用后,想通过实验粗测铅笔笔芯的电阻率;
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943186918449152/2944098098847744/STEM/2354ffc8-4956-44f8-aaf9-fcf5ccdcaedc.png?resizew=526)
(1)用多用电表欧姆挡粗测铅笔芯的电阻:连接电阻前,电表指针未指在表盘最左侧零刻度位置,应进行___________ (选填“机械”或“欧姆)调零,选择“×1Ω”挡后,将两表笔短接,调节欧姆调零旋钮,使电表指针指到表盘___________ (选填“左”或“右”)侧零刻度处;某次测量指针位置如图甲所示,可得铅笔芯的阻值R=___________ Ω,完成测量后,把选择开关拨至___________ (选填“直流”或“交流”)电压最大值挡。
(2)用螺旋测微器测量铅笔芯的直径d,测量结果如图乙所示,则d=___________ mm。用毫米刻度尺测得此铅笔芯的长度为L,可测得该铅笔芯的电阻率ρ=___________ 。(用d、L、R表示)
![](https://img.xkw.com/dksih/QBM/2022/3/14/2943186918449152/2944098098847744/STEM/2354ffc8-4956-44f8-aaf9-fcf5ccdcaedc.png?resizew=526)
(1)用多用电表欧姆挡粗测铅笔芯的电阻:连接电阻前,电表指针未指在表盘最左侧零刻度位置,应进行
(2)用螺旋测微器测量铅笔芯的直径d,测量结果如图乙所示,则d=
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【推荐2】家庭安装空调需要用优质的铜导线,鉴别导线是否优质的方法之一就是测量其电阻率.小明将家里标称长度为100 m的铜导线带到实验室,测量其电阻率,实验室提供的器材有:
A.多用电表 B.螺旋测微器 C.直流电源(电动势为3 V,内阻不计)
D.电压表V(量程为15 V,内阻约为1 kΩ)
E.电流表A1(量程为100 mA,内阻r1为3 Ω)
F.电流表A2(量程为1.5 A,内阻r2约为0.2 Ω)
G.定值电阻R0=2 Ω H.电阻箱R(0~99 Ω) I.滑动变阻器R1(最大阻值为10 Ω)
J.滑动变阻器R2(最大阻值为100 Ω) K.开关、导线若干
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179615245582336/2180846384455681/STEM/5bc081c0-7f30-446a-9ac2-137c0dc99691.png?resizew=88)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179615245582336/2180846384455681/STEM/06f313bf-196f-460d-96d4-1c368310b77a.png?resizew=453)
(1)小明用螺旋测微器测量该铜导线的直径,测量结果如图甲所示,则该铜导线的直径为____ mm.
(2)小明用多用电表欧姆挡测量该铜导线的电阻,发现用“×1”挡时多用电表指针没有变化,于是他将定值电阻R0与铜导线串联后重新用“×1”挡测量,多用电表指针位置如图乙所示,其读数为____ Ω.
(3)为了进一步精确测量该铜导线的电阻,小明选择滑动变阻器____ (填“R1”或“R2”).
(4)选完所有器材后,需画电路图,请帮小明在方框中画出最合理的实验电路图,铜导线用电阻符号表示____ .
(5)小明通过实验测量铜导线的电阻的表达式为Rx=____ (A1的示数用I1表示,A2的示数用I2表示,电阻箱阻值用R表示).
A.多用电表 B.螺旋测微器 C.直流电源(电动势为3 V,内阻不计)
D.电压表V(量程为15 V,内阻约为1 kΩ)
E.电流表A1(量程为100 mA,内阻r1为3 Ω)
F.电流表A2(量程为1.5 A,内阻r2约为0.2 Ω)
G.定值电阻R0=2 Ω H.电阻箱R(0~99 Ω) I.滑动变阻器R1(最大阻值为10 Ω)
J.滑动变阻器R2(最大阻值为100 Ω) K.开关、导线若干
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179615245582336/2180846384455681/STEM/5bc081c0-7f30-446a-9ac2-137c0dc99691.png?resizew=88)
![](https://img.xkw.com/dksih/QBM/2019/4/10/2179615245582336/2180846384455681/STEM/06f313bf-196f-460d-96d4-1c368310b77a.png?resizew=453)
(1)小明用螺旋测微器测量该铜导线的直径,测量结果如图甲所示,则该铜导线的直径为
(2)小明用多用电表欧姆挡测量该铜导线的电阻,发现用“×1”挡时多用电表指针没有变化,于是他将定值电阻R0与铜导线串联后重新用“×1”挡测量,多用电表指针位置如图乙所示,其读数为
(3)为了进一步精确测量该铜导线的电阻,小明选择滑动变阻器
(4)选完所有器材后,需画电路图,请帮小明在方框中画出最合理的实验电路图,铜导线用电阻符号表示
(5)小明通过实验测量铜导线的电阻的表达式为Rx=
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