在“测定金属的电阻率”的实验中,某同学进行了如下测量:
(1)该同学先用多用电表粗测其电阻,用已经调零且选择开关指向欧姆挡“
”挡位的多用电表测量,表盘及指针所指位置如图甲所示,则此段电阻丝的电阻为______ Ω;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/272d860a-35cf-453e-899b-f072c34abc8e.png?resizew=422)
(2)用毫米刻度尺测量接入电路中的被测金属丝的有效长度L,用螺旋测微器测量金属丝的直径d,其中一次测量结果如图乙所示,其示数为______
;
(3)若电压表的内阻很大,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;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/91438f58-576c-402e-bc70-45888ac0758b.png?resizew=350)
(4)准确地测量金属丝两端的电压U及电流I,最后由公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
______ (用直接测量的物理量符号表示)计算出金属丝的电阻率。
(1)该同学先用多用电表粗测其电阻,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://img.xkw.com/dksih/QBM/editorImg/2022/7/12/272d860a-35cf-453e-899b-f072c34abc8e.png?resizew=422)
(2)用毫米刻度尺测量接入电路中的被测金属丝的有效长度L,用螺旋测微器测量金属丝的直径d,其中一次测量结果如图乙所示,其示数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(3)若电压表的内阻很大,为了减小实验误差,应选用图中
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/91438f58-576c-402e-bc70-45888ac0758b.png?resizew=350)
(4)准确地测量金属丝两端的电压U及电流I,最后由公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
更新时间:2022-07-12 12:38:49
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【推荐1】某同学想研究导线的电阻与其直径的关系,他截取了4段长度相同、直径不同的同种导线,按如下过程进行研究:
(1)用螺旋测微器测各导线的直径.当测微螺杆处于如图甲所示的位置时,应操作部件
_________ (“A”、“B”、“C”)完成测量,这样有利于保护螺旋测微器,并使测量准确.某次测量如图乙所示,该导线的直径为_________ mm.
![](https://img.xkw.com/dksih/QBM/2016/4/8/1575853627711488/1575853627940864/STEM/0622b045-934b-4bb6-9910-707c344ee2d0.png?resizew=466)
(2)图丙为该同学的实验原理图,若取下实物连接图丁中的导线________ ,就可符合原理图.
(3)若在实验中分别测得各导线两端的电压U和直径d,他想通过图象来直观地得到导线的电阻与其直径的关系,该同学应该画U﹣______ 图象.
(1)用螺旋测微器测各导线的直径.当测微螺杆处于如图甲所示的位置时,应操作部件
![](https://img.xkw.com/dksih/QBM/2016/4/8/1575853627711488/1575853627940864/STEM/0622b045-934b-4bb6-9910-707c344ee2d0.png?resizew=466)
(2)图丙为该同学的实验原理图,若取下实物连接图丁中的导线
(3)若在实验中分别测得各导线两端的电压U和直径d,他想通过图象来直观地得到导线的电阻与其直径的关系,该同学应该画U﹣
![](https://img.xkw.com/dksih/QBM/2016/4/8/1575853627711488/1575853627940864/STEM/dfa62e59-1312-47dd-a545-5c1985518519.png?resizew=552)
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【推荐2】在“测定金属的电阻率”的实验中,用螺旋测微器测量金属丝直径时的刻度位置如图所示,用米尺测出金属丝的长度
,金属丝的电阻大约为
,先用伏安法测出金属丝的电阻
,然后根据电阻定律计算出该金属材料的电阻率。
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/5a680ee4-e45f-451c-aa4b-29b056171ed1.png?resizew=119)
(1)从图中读出金属丝的直径为___________
。
(2)为此取来两节新的干电池、开关和若干导线及下列器材:
A.电压表
,内阻约![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b83e1d413d48afddd05d9b6b182815.png)
B.电压表
,内阻约![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9df7c4451a17142088a8220917c3b7.png)
C.电流表
,内阻约![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c26611f3be42190e60a40165cfa6af7.png)
D.电流表
,内阻约![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0210026c88ec845716829b24ecc77f.png)
E.滑动变阻器,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fe7f473a67ee2367ffbd8bec067b44.png)
F.滑动变阻器,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5da295ce39cf1df62bac67e0ee57bc1.png)
要求较准确地测出金属丝的阻值
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/103a737d-4a54-4f90-a402-7f322049099a.png?resizew=317)
①电路应该采用电流表___________ 电路(填内接或外接),滑动变阻器选___________ (填序号);
②实验中实物接线如图所示,有两根导线明显接错,这两处明显接错的导线序号是第___________ 和第___________ 。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c37f2f0b640947dcce6214db72a6b321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/5a680ee4-e45f-451c-aa4b-29b056171ed1.png?resizew=119)
(1)从图中读出金属丝的直径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)为此取来两节新的干电池、开关和若干导线及下列器材:
A.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6bb65878785532d817f8fd11a9ef3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b83e1d413d48afddd05d9b6b182815.png)
B.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edaab27d71cd1a342f454c8853e69e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9df7c4451a17142088a8220917c3b7.png)
C.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5c929172bbfc21741fa7ef1f53b7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c26611f3be42190e60a40165cfa6af7.png)
D.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9d332743ec267382cd99600b757cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0210026c88ec845716829b24ecc77f.png)
E.滑动变阻器,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fe7f473a67ee2367ffbd8bec067b44.png)
F.滑动变阻器,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5da295ce39cf1df62bac67e0ee57bc1.png)
要求较准确地测出金属丝的阻值
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/103a737d-4a54-4f90-a402-7f322049099a.png?resizew=317)
①电路应该采用电流表
②实验中实物接线如图所示,有两根导线明显接错,这两处明显接错的导线序号是第
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【推荐3】在“用
测电源的电动势和内阻”的实验,图(a)为实验电路图,定值电阻
,R为滑动变阻器,图(b)为实验的实物连接图。
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/2a0d4053-cb2b-4f0e-8e29-db86108e5af3.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/c2ca4192-abdf-491a-a9ee-b123f8bd75a2.png?resizew=324)
(1)请用笔画线代替导线,按图(a)的连接完成该实物连接图。( )
(2)A组同学实验测得的路端电压U相应电流I的拟合曲线如图(c)所示,由此得到电源电动势为______________ V,内电阻为______________
。
(3)根据图(c)中实验测得的数据,可以推测实验中选用滑动变阻器的型号较合理的是( )
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754d11bb858377d3ea4dbb2ec86a4d07.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/eef44b87-2298-4784-aad2-ee1da4ea37d1.png?resizew=230)
(4)B组同学也利用A组用的同一套器材完成此实验,误把图(a)中电压传感器在d点的接线接在c点,测得数据也在同一坐标中作出
图像,其他操作、读数等都准确无误,则B组画出的图线与纵轴的交点相应的电压值和A组相比,______________ (选填:偏大、相同、偏小或无法确定)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d5831de5c237cf25b0c2cb325f6263f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4eeebc2bc492b535d7eac16d85879e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/2a0d4053-cb2b-4f0e-8e29-db86108e5af3.png?resizew=175)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/c2ca4192-abdf-491a-a9ee-b123f8bd75a2.png?resizew=324)
(1)请用笔画线代替导线,按图(a)的连接完成该实物连接图。
(2)A组同学实验测得的路端电压U相应电流I的拟合曲线如图(c)所示,由此得到电源电动势为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
(3)根据图(c)中实验测得的数据,可以推测实验中选用滑动变阻器的型号较合理的是
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f025a79f1af9f93f98549d015be6d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b65177eb9c7ace11b185dec72574949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5056ca4851801d2c3892ac845840ddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754d11bb858377d3ea4dbb2ec86a4d07.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/eef44b87-2298-4784-aad2-ee1da4ea37d1.png?resizew=230)
(4)B组同学也利用A组用的同一套器材完成此实验,误把图(a)中电压传感器在d点的接线接在c点,测得数据也在同一坐标中作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e43cca5751eff3d24b64cb51006d6d7.png)
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【推荐1】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:
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
,电路原理图如下所示,图中甲电流表应选______ ;乙电流表应选______ 。(选填C、D、E)
(3)闭合开关,测量出需要测量的物理量。需要测量的物理量是______ 和______ 。
(4)根据(1)(3)步测量的数据字母,表示出电阻率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
______ 。
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594227904847872/2594457541541888/STEM/80c09d34-b090-4296-95e8-01ae04cfa97f.png?resizew=633)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76caa19ec164ba47b2ff45eb4a7a1f87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.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/76caa19ec164ba47b2ff45eb4a7a1f87.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/e04a1de808c8e1e076acca4e11a260e2.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/dd19f52dcd100f155172c30cc1973433.png)
F.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439cf34bb7c9e88529d884b755cb090e.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/a02984dfb38862398b79b511720bfc1b.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/76caa19ec164ba47b2ff45eb4a7a1f87.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)
(3)闭合开关,测量出需要测量的物理量。需要测量的物理量是
(4)根据(1)(3)步测量的数据字母,表示出电阻率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594227904847872/2594457541541888/STEM/80c09d34-b090-4296-95e8-01ae04cfa97f.png?resizew=633)
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594227904847872/2594457541541888/STEM/5c211d83-4cc2-4dd2-b143-fda6671c1603.png?resizew=174)
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【推荐2】为了测定合金的电阻率及干电池的电动势和内阻,设计了如图甲所示的电路,MN为一段粗细均匀、电阻率较大的电阻丝,定值电阻R0=1.2Ω。实验中,闭合电键S,调节滑片P,记录电压表示数U、电流表示数I及对应的PN长度x,绘制出图乙所示的U-I图线。
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953125292720128/2953220812791808/STEM/315ac349-cf0e-4ae2-8edd-0a2cb8092da0.png?resizew=583)
(1)由图乙求得电池的电动势E=_________ V,内阻r=________ Ω。(结果保留到小数点后2位)
(2)实验中因电表内阻的影响,电动势测量值______ 真实值(填“大于”“等于”或“小于”)。
(3)根据实验数据可绘出图丙所示的
-x图线。若合金丝横截面积s=7.85×10-8m2,则电阻丝的电阻率
=_________ Ω·m,电表内阻对电阻率的测量_____ 影响(填“有"或“无”)。
![](https://img.xkw.com/dksih/QBM/2022/4/7/2953125292720128/2953220812791808/STEM/315ac349-cf0e-4ae2-8edd-0a2cb8092da0.png?resizew=583)
(1)由图乙求得电池的电动势E=
(2)实验中因电表内阻的影响,电动势测量值
(3)根据实验数据可绘出图丙所示的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b763290c8cb341f8c5b268ccc22e61bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ca5e2fc826c6c206f1cc5e0fd4cd22.png)
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实验题
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【推荐3】某同学欲测量一粗细均匀的金属棒的电阻率。
(1)用游标卡尺测得该材料的长度L如图甲所示,读数L=_______ mm;用螺旋测微器测得该材料的直径D如图乙所示,读数D=_______ mm;
![](https://img.xkw.com/dksih/QBM/2021/10/16/2830795398750208/2831298690400256/STEM/90d58275-98f2-4ef0-9354-771707fcce54.png?resizew=362)
(2)该同学为了测定金属棒的电阻设计了如图丙的电路图,用电压表与电流表读数之比来得到电阻的测量值,若考虑电表内阻引起的系统误差,则电阻的测量值相较于真实值_____ ;(选填“偏大”或“偏小”)
![](https://img.xkw.com/dksih/QBM/2021/10/16/2830795398750208/2831298690400256/STEM/468a79df-89b9-4a06-99a8-ad52145f727e.png?resizew=188)
(3)设测得导电材料的电阻为R,导电材料的长度为L,导电材料的直径为D,求得导电材料的电阻率为_________ (用题目所给字母表示)。
(1)用游标卡尺测得该材料的长度L如图甲所示,读数L=
![](https://img.xkw.com/dksih/QBM/2021/10/16/2830795398750208/2831298690400256/STEM/90d58275-98f2-4ef0-9354-771707fcce54.png?resizew=362)
(2)该同学为了测定金属棒的电阻设计了如图丙的电路图,用电压表与电流表读数之比来得到电阻的测量值,若考虑电表内阻引起的系统误差,则电阻的测量值相较于真实值
![](https://img.xkw.com/dksih/QBM/2021/10/16/2830795398750208/2831298690400256/STEM/468a79df-89b9-4a06-99a8-ad52145f727e.png?resizew=188)
(3)设测得导电材料的电阻为R,导电材料的长度为L,导电材料的直径为D,求得导电材料的电阻率为
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