(1)如图甲所示,用螺旋测微器测量合金丝的直径时,从调节到读数的过程中,螺旋测微器上三个部件A、B、C使用的先后顺序应该为
(2)请根据表格中数据,在图乙中用笔画线代替导线把电路连接补充完整
![](https://img.xkw.com/dksih/QBM/2022/1/15/2902134698917888/2902643903209472/STEM/69ac070b-244a-4191-abb8-aefa41ad90de.png?resizew=369)
(3)小明在实验室找了两节干电池进行实验,正确连接电路后,发现调节滑动变阻器,电压表和电流表的示数变化范围非常小,原因是
(4)正确连接电路后,小明利用刻度尺测出合金丝接入电路的长度L=59.99cm,闭合开关,调节滑动变阻器,读出电压表和电流表的示数,在方格纸上作出U-I图象如图丙,发现图像是一条倾斜直线,计算该合金丝电阻R=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
电流I/A | 0 | 0.08 | 0.11 | 0.15 | 0.19 | 0.27 | 0.38 | 0.56 |
电压U/V | 0 | 0.19 | 0.29 | 0.44 | 0.60 | 0.80 | 1.15 | 1.70 |
![](https://img.xkw.com/dksih/QBM/2022/1/15/2902134698917888/2902643903209472/STEM/3bddb383-785e-4d00-832e-1c0ac80ec551.png?resizew=282)
相似题推荐
(1)如图甲,利用螺旋测微器测出该金属导体的直径为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/6973c91f-57f6-4499-81c3-c44390745104.png?resizew=369)
(2)他决定先用多用电表“粗测”金属的电阻.多用电表内部结构如图乙所示,可知
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/d6d1de48-2874-474f-8c58-916cd162cb9b.png?resizew=502)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/285ea3e6-489a-4ee9-891c-89fdf5996595.png?resizew=359)
(3)小敏使用多用电表的过程中对其内部结构产生了兴趣,如图乙,表头内阻Rg=100Ω,满偏电流Ig=200μA,已知该表拥有1mA和2.5mA两个直流电流量程,通过计算可知,R1+R2=
【推荐2】某实验小组想测量一段粗细均匀合金材料的电阻率,用多用电表测得该合金材料的电阻R2大约为5kΩ,除被测电阻外,还有如下实验仪器:
A.电源(电动势6V, 内阻约为2Ω)
B.电流表A1(量程0~1mA, 内阻约为15Ω)
C.电流表A2(量程0~300mA,内阻约为100Ω)
D.电压表V (量程0 ~ 5V, 内阻约5kΩ)
E.滑动变阻器R₁(0~20Ω,额定电流2A)
F.滑动变阻器R₂(0~5Ω,额定电流0.2A)
G.开关、导线若干
实验步骤如下:
(1)上述器材中,应该选用的电流表是
(2)为减小误差,应选采用下列实验电路图进行实验,较合理的是
(3)用螺旋测微器测合金材料的直径D,示数如图甲所示,其直径D为
(4)若电流表示数为I、 电压表示数为U,则合金材料的电阻率的表达式为
A.毫米刻度尺
B.螺旋测微器
C.电流表A1(量程600 mA,内阻约为1.0 Ω)
D.电流表A2(量程3 A,内阻约为0.1 Ω)
E.电压表V(量程3 V,内阻约为6 kΩ)
F.滑动变阻器R1(2 kΩ,允许通过的最大电流0.5 A)
G.滑动变阻器R2(10 Ω,允许通过的最大电流2 A)
H.蓄电池E(电动势为6 V,内阻约为0.05 Ω)
I.开关一个,带夹子的导线若干.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/9c6abe10-2201-43ce-a9ad-1d0b9c4edbcf.png?resizew=265)
①上述器材中,应该选用的电流表是
②若某次用螺旋测微器测得样品截面外缘正方形边长如图乙所示,则其值为
③要求尽可能测出多组数据,你认为在图的甲、乙、丙、丁中选择哪个电路图
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/42461cc1-4780-401f-a113-cf0a38d26555.png?resizew=689)
④若样品截面外缘正方形边长为a、样品长为L、电流表示数为I、电压表示数为U,则计算内芯截面积的表达式为S=
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/4ccc7317-708b-41f9-aa72-8eae3b42fc97.png?resizew=195)
(1)测量一段电阻约为几欧姆金属丝的电阻时所用器材和部分电路连线如图1所示,若电流表内阻约为几十欧姆,量程为0-0.6A或0-3A,电压表内阻约为几千欧姆,量程为0-3V或
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a6e1dfeb173fd8d2dc5cfce6fd973f.png)
(2)合上开关之前,图1中滑动变阻器滑片应置于最
(3)连好电路之后,合上开关,调节滑动变阻器,得到多组U和I数据。甲同学由每组U、I数据计算电阻,然后求电阻平均值,乙同学通过U-I图像求电阻。则两种求电阻的方法更合理的是
(4)两同学进一步探究用镍铬丝将满偏电流
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb9ce2e461d24b0e4ce1959c33d37000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ae6fc11059a5114bd6c832d0a36f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ae6fc11059a5114bd6c832d0a36f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/b6b94fa0-2d46-4a88-b208-e12ccfd78dd5.png?resizew=313)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a6041c88c8701ce1068b611f27aa4a.png)
A.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c783bab7586f60dc14d4f10b6d5b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53911fb9620b517e46d4e47cd58a5dae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e64be02afecfa2ad4aadf27d29ef3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ab1b791f514ffc00a4029cff413746.png)
B.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910928687da37388715dd531939fbfed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db8b00e17ccaab47520ebe262c7aaf5.png)
C.游标卡尺
D.变阻箱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1bab1bdc34bfaebac75c7ec972df3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ba3ede0350b32e2d94c813d27f2183.png)
E.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0552ad6856a3caf8864457a3597b577d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78aa8e890d2ac882e0fe79598811777a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c327d0f1396ddc8f8a4c1662cd626.png)
F.电池组(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b26d0e154ef213ebe194b8b5e519f13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47367bf5c848198638bc6d92ebe37262.png)
G.一个开关和导线若干
他进行了以下操作:
(1)用游标卡尺测量这段电阻丝的直径,如图所示,则该次测量的电阻丝直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/21a4a500-fcfe-472a-ab5f-d9c35a23094f.png?resizew=172)
(2)把电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c783bab7586f60dc14d4f10b6d5b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b26d0e154ef213ebe194b8b5e519f13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/596685ed-0e46-484d-b570-2e9a2d9b7575.png?resizew=398)
(3)设计实验电路图.虚线框中只是他设计的实验电路图的一部分,请帮他将电路图补画完整
(4)实验电路连接.该同学完成了部分连接,请帮他补充完整.
(5)测量并计算电阻率.闭合开关,调节滑动变阻器的滑片到某确定位置,电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c783bab7586f60dc14d4f10b6d5b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
![](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/9d784ac902fe86e7bdcdd3fa5cc3ba83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
(1)先用多用表的欧姆挡粗测其电阻,记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d7fe422e1ff6f96d365e8c08c32eea.png)
(2)由图乙螺旋测微器测量该金属丝的直径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2023/11/7/3362880200089600/3363825549336576/STEM/33e4f775975b4ddf9b35b2fecc798b4d.png?resizew=483)
(3)为了减小实验误差,需进一步测量其电阻,除待测金属丝、开关
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a454a2c91ace8ef50412a6adf91f8086.png)
A.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b26d0e154ef213ebe194b8b5e519f13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b8489b17608927e9ba3f6d2da1f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb4bcbd9cbba7000bf5154da782db51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2ab5e570e63c28918742f29cb47c69.png)
B.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db586f2c37b26089713ff02346e6d0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db144c76e36b0c4d950698b2bbc39f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9d1ce44013cb5ba7c6038dabc2803d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910928687da37388715dd531939fbfed.png)
C.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6196cc4d198bcb1514a773202f78546a.png)
D.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec3342376af1184beab6bb13c9ec324.png)
E.电阻箱
F.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2b2c17a78210bcee15917ed1101102.png)
为了测量多组实验数据,则滑动变阻器应选用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
(4)实验电路如图丁所示,根据电路图完成图戊中的实物连线.
![](https://img.xkw.com/dksih/QBM/2023/11/7/3362880200089600/3363825549336576/STEM/70e8ff16b7f84fba9449a21bb9319d50.png?resizew=401)
(5)从实验原理上看,待测电阻测量值
(6)如果测得金属丝长度为
![](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/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749c847238b98f54dc54e910919cc1d6.png)
(1)研究小组先用刻度尺测出了两电极相距L,再用游标卡尺测量玻璃管的内径D时,应选用图甲中的
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/a78b5319-2124-421e-a6ea-508cf79e4c1f.png?resizew=374)
(2)在用“伏安法”测量水样的阻值时,有以下器材供选用:
A.电流表(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95341e9e297fe09cba87d7c91c4320e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e278c32ede0c61f56cb6c0dc50dc29.png)
B.电流表(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5c929172bbfc21741fa7ef1f53b7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ab2f0235f0af8382c50f98733862f.png)
C.电压表(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaab27d71cd1a342f454c8853e69e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94435abd92f9e157066cfb7f4e1b514.png)
D.滑动变阻器(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c100d87f64ee13592d4bc62a46184595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6699c896d7394a071917fe3922f3864f.png)
E.电源(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9e557b18168d9ec84e65fb46057d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd5d16bd2c1c2aa3e6ebbd2c534e3eb.png)
F.开关和导线若干
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/d00bf216-2e4e-4ef5-899c-ad745fd04f9a.png?resizew=449)
(3)测量水样的阻值,电流表应选用
(4)图丙是实验器材实物图,已连接了部分导线,请补充完成实物图的连线
(5)某次测量时,电压表示数为U,电流表示数为I,则自来水样品的电导率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba61d4d157df174c22cbc12d2495cad.png)
A.电源(电源电动势E=8V,内阻约10Ω)
B.电流表G,内阻Rg=120Ω,满偏电流Ig=6mA
C.电压表V,量程为0~6V,内阻约为1000Ω
D.电阻箱R0(0~99.99Ω)
E.滑动变阻器R1(0~20Ω)
F.开关及导线若干
G.被测金属圆柱体Rx
(1)实验设计时,把电流表G与电阻箱并联,改装成量程为0~0.6A的电流表使用,则电阻箱的阻值应调为R0=
(2)为了多测几组数据,并且尽量精确测量圆柱体的电阻,请在下面的方框内画出实验电路图
![](https://img.xkw.com/dksih/QBM/2019/1/5/2112300995411968/2114327632035840/STEM/e5cfaec0-617c-419e-a399-0574687f2525.png?resizew=180)
(3)将实验中测得的多组电压表和电流计的示数,在U-I图象中描点,如图所示,请根据描点作图
![](https://img.xkw.com/dksih/QBM/2019/1/5/2112300995411968/2114327632035840/STEM/5ded1880-74c1-4914-9487-dbfa33007fac.png?resizew=270)
(4)若测得圆柱体的长度为L,截面直径为D,测得圆柱体的电阻为Rx。写出计算电阻率的表达式ρ=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
A.待测金属丝电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b120f021f5e9596eb99008884e6e61a2.png)
C.量程50 mA,内阻约为50
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b120f021f5e9596eb99008884e6e61a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b120f021f5e9596eb99008884e6e61a2.png)
E.量程6 V,内阻约为15 k
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b120f021f5e9596eb99008884e6e61a2.png)
F.最大阻值15
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b120f021f5e9596eb99008884e6e61a2.png)
G.最大阻值15 k
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b120f021f5e9596eb99008884e6e61a2.png)
H.开关一个,导线若干
(1)为了操作方便,且能比较精确的测量金属丝的电阻值,电流表选用
(2)根据所选用的实验器材,设计出测量电阻的下列甲、乙、丙、丁四种电路,为尽可能减少实验误差,应采用
甲.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/ef8630f8-cce3-4011-b58a-57a29482cdbb.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/f377fe79-3b75-4b11-a24b-efb555eeb6d0.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/89972d47-8fa3-4e87-9654-02d2f84abc44.png?resizew=129)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/a7a99a36-189f-47d0-a788-08d09c1b695f.png?resizew=128)
(3)实验中测得该金属丝直径为d,长度为L,接入电路后,电压表示数为U,电流表示数为I,则该金属丝的电阻率的表达式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)