在“探究导体电阻与其影响因素的定量关系”实验验中,某同学为了探究不同材料电阻率,找了三根横截面积相同的电阻丝L1、L2、L3,首尾相连(连接处电阻不计),接成如图所示的实验电路。M为电阻丝L3的左端点,O为电阻丝L1的右端点,P是电阻丝上可移动的接触点。在实验过程中,电流表读数始终为I=0.50A,测得电压表读数U随OP间距离L的变化如下表:
![](https://img.xkw.com/dksih/QBM/2016/8/1/1575908881154048/1575908881645568/STEM/637358c5-7321-4b02-af79-157082680c0f.png?resizew=231)
(1)绘出电压表读数U随OP间距离L变化的图线_____ ;
(2)电阻丝的电阻率最小的是___ (填“L1”、 “L2”、“ L3”);
![](https://img.xkw.com/dksih/QBM/2016/8/1/1575908881154048/1575908881645568/STEM/5205e3ec-3c32-4175-ac06-e4d60701f13a.png?resizew=325)
![](https://img.xkw.com/dksih/QBM/2016/8/1/1575908881154048/1575908881645568/STEM/637358c5-7321-4b02-af79-157082680c0f.png?resizew=231)
L/mm | 60 | 70 | 80 | 90 | 100 | 120 | 140 | 160 | 180 | 200 | 210 | 220 | 230 | 240 |
U/V | 3.95 | 4.50 | 5.10 | 5.90 | 6.50 | 6.65 | 6.82 | 6.93 | 7.02 | 7.15 | 7.85 | 8.50 | 9.05 | 9.75 |
(2)电阻丝的电阻率最小的是
![](https://img.xkw.com/dksih/QBM/2016/8/1/1575908881154048/1575908881645568/STEM/5205e3ec-3c32-4175-ac06-e4d60701f13a.png?resizew=325)
更新时间:2016-12-08 22:17:44
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相似题推荐
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【推荐1】在“金属丝电阻率的测量”实验中。实验室器材有:一段粗细均匀的待测金属丝、电压表
(
)、电流表
(
)、两节干电池组、滑动变阻器、刻度尺、螺旋测微器、开关和导线若干。
(1)用刻度尺测量接入电路的金属丝长度
;用螺旋测微器测金属丝的直径
,其示数如图1所示,则金属丝直径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
__________
;
(2)某同学设计了如图2所示的实验电路。在开关闭合前,请你帮该同学再检查一下这个电路。请指出电路中错误的或不合理的一处__________ ;
(3)电路正确调整后,改变滑动变阻器的阻值进行五次测量,获得五组
、
的数据。为使测量结果更准确,用平均值的方法来测定电阻丝的电阻
。实验小组用表格
、B记录和处理数据,你认为比较合理的是__________ (填“
”或“B”);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
B
(4)用测得的物理量表示金属丝的电阻率为___________ 。(用
、
、
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008c1c32c22ff5138c62021cfbce46ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98dfef8faec774a9f807cc76a97c4a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/26/64a5bcd9-beac-4115-ac51-7f2d1d071fb4.png?resizew=407)
(1)用刻度尺测量接入电路的金属丝长度
![](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/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)某同学设计了如图2所示的实验电路。在开关闭合前,请你帮该同学再检查一下这个电路。请指出电路中错误的或不合理的一处
(3)电路正确调整后,改变滑动变阻器的阻值进行五次测量,获得五组
![](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/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
次数 | 1 | 2 | 3 | 4 | 5 | 平均值 | ![]() |
![]() | 0.50 | 0.75 | 1.25 | 1.75 | 2.00 | 1.25 | 3.21 |
![]() | 0.15 | 0.25 | 0.40 | 0.55 | 0.60 | 0.39 |
B
次数 | 1 | 2 | 3 | 4 | 5 | 平均值 |
![]() | 0.50 | 0.75 | 1.25 | 1.75 | 2.00 | |
![]() | 0.15 | 0.25 | 0.40 | 0.55 | 0.60 | |
![]() | 3.33 | 3.00 | 3.13 | 3.18 | 3.33 | 3.19 |
(4)用测得的物理量表示金属丝的电阻率为
![](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/4aa0df7f1e45f9de29e802c7f19a4f64.png)
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名校
【推荐2】现在要测量一段电阻丝的电阻率
,电阻丝的阻值
,允许通过的最大电流为0.5A。现提供如下器材:
(1)下面四位同学分别设计的“测量部分”的电路,你认为合理的是__________ 。
A.
B.![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/3aab1a08-91d3-431b-8e91-0a1a7b6f32e1.png)
C.
D.![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/4a3a4ff9-0c30-4f75-987c-efc2eeb654ad.png)
(2)根据你在(1)中的选择,在答题卡上的实物图中完成实验电路的连接_________ 。
(3)实验中,如果两电表的读数分别为U和I,测得拉直后电阻丝的长度为L,直径为D,则待测电阻丝的电阻率
的计算式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
__________ 。
(4)用螺旋测微器测量待测电阻丝的直径时读数如图所示,则该电阻丝的直径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
_________ mm。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a874da1282f0d91d98a9f15c769386c.png)
电流表A(量程0.6A,内阻约![]() | 电压表V(量程3V,内阻约![]() |
待测的电阻丝![]() ![]() | 标准电阻![]() ![]() |
滑动变阻器![]() | 开关S、导线若干 |
直流电源E(电动势6V) |
(1)下面四位同学分别设计的“测量部分”的电路,你认为合理的是
A.
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/128cbc54-436c-4079-838d-c18d9cf36e5d.png)
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/3aab1a08-91d3-431b-8e91-0a1a7b6f32e1.png)
C.
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/b84d82fc-ec3d-4334-9716-82cf025abc09.png)
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/4a3a4ff9-0c30-4f75-987c-efc2eeb654ad.png)
(2)根据你在(1)中的选择,在答题卡上的实物图中完成实验电路的连接
(3)实验中,如果两电表的读数分别为U和I,测得拉直后电阻丝的长度为L,直径为D,则待测电阻丝的电阻率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
(4)用螺旋测微器测量待测电阻丝的直径时读数如图所示,则该电阻丝的直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/16/2637289160065024/2638744881684480/STEM/c3acaf17-85c9-4782-bd54-bbb273d5c57e.png?resizew=445)
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【推荐3】某物理兴趣小组测量一段粗细均匀的合金丝的电阻率
。
(1)实验开始前,用螺旋测微器测量合金丝的直径D,如图读数为________ mm。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/597d7cb2-81e6-464b-92b2-e883a7737153.png?resizew=117)
该合金丝电阻
的阻值约为
,现要精确测量其电阻,实验室提供以下器材:
A.电源E(电动势为12V,内阻约为
)
B.电压表V1(量程0~3V,内阻约为
)
C.电压表V2(量程0~15V,内阻约为
)
D.电流表A(量程0~0.6A,内阻约为
)
E.滑动变阻器R(最大阻值
,额定电流1A)
F.滑动变阻器
(最大阻值
,额定电流1A)
G.定值电阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb86325922e5c1dba18ac038ee4e9e60.png)
H.定值电阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9f1f7a72d58407c9577743408fde44.png)
L.开关S及导线若干
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/de25036f-bba3-4597-99da-1e633445f664.png?resizew=164)
为了精确测量该合金丝的阻值,要求电表读数不少于量程的
。
(2)在可供选择的器材中,滑动变阻器应选________ ,定值电阻应选_________ (皆填仪器前的序号)。
(3)在答题卡的虚线框中补充完整电路结构(并标注所用器材符号)____ 。
(4)若在某次实验中,电压表的读数为U,电流表的读数为I,该合金丝接入电路的有效长度为L,则该合金丝的电阻率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
__________ (物理量用题中所给字母表示)。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
(1)实验开始前,用螺旋测微器测量合金丝的直径D,如图读数为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/597d7cb2-81e6-464b-92b2-e883a7737153.png?resizew=117)
该合金丝电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3268ee21400e819481400197ea8dc736.png)
A.电源E(电动势为12V,内阻约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d941822843eff28c70023ea38051c307.png)
B.电压表V1(量程0~3V,内阻约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df7f95cc0b9be6dbe2d4e73fcb336f5.png)
C.电压表V2(量程0~15V,内阻约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94435abd92f9e157066cfb7f4e1b514.png)
D.电流表A(量程0~0.6A,内阻约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d941822843eff28c70023ea38051c307.png)
E.滑动变阻器R(最大阻值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b49bd50cc6fc1307c907c8e5bc953de.png)
F.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39bbd217b46c20ecf533c0641ebb7ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b132e0cbd0e446630f4bb65804ce581.png)
G.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb86325922e5c1dba18ac038ee4e9e60.png)
H.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9f1f7a72d58407c9577743408fde44.png)
L.开关S及导线若干
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/de25036f-bba3-4597-99da-1e633445f664.png?resizew=164)
为了精确测量该合金丝的阻值,要求电表读数不少于量程的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(2)在可供选择的器材中,滑动变阻器应选
(3)在答题卡的虚线框中补充完整电路结构(并标注所用器材符号)
(4)若在某次实验中,电压表的读数为U,电流表的读数为I,该合金丝接入电路的有效长度为L,则该合金丝的电阻率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
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【推荐1】某探究小组在实验室“研究导体电阻与其影响因素的定量关系”,找到如下电阻定律实验器材,并设计如图电路图:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/a56c6385-f967-49c1-b277-dd0fd8df8fa9.png?resizew=275)
(1)a、b是康铜合金丝,c、d是镍铬合金丝,c的长度是其它三条的两倍,b的直径是其它三条的两倍,其他条件相同。该探究小组在实验前已经学习了电阻的相关知识,电压表
、
、
、
,读数分别为
、
、
、
,则当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5b0b00f041cb2dc51aa0e8992dfd5b.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c7bc14cad817364e69bff314e683e9.png)
______ 时,才能验证电阻的决定式。
(2)该小组研究了导体电阻与其影响因素的定量关系之后,想测定某金属丝电阻率,现有如下器材:
A.干电池两个(内阻忽略不计),导线若干,开关一个
B.电流表
(量程0.6A,内阻约
)
C.电流表
(量程3A,内阻约
)
D.电压表
(量程3V,内阻约
)
E.电压表
(量程15V,内阻约
)
F.待测电阻
(约为
)
G.滑动变阻器
(
)
H.滑动变阻器
(
)
为使
两端变化范围更广,测量结果更准确,则除待测电阻
外,上述实验器材应选哪几个______ (用所选仪器前的字母代表),并在下边虚线中画出电路图_________ 。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/9b36841b-079c-495a-8a9a-e09c40e21a06.png?resizew=214)
(3)用刻度尺测出铜丝长度为L,用螺旋测微计测出铜丝直径如下图所示,则直径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
______ mm,电路连接正确后,电流表、电压表的示数分别为I和U,则该铜丝的电阻率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
______ (结果用字母表示)。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/a56c6385-f967-49c1-b277-dd0fd8df8fa9.png?resizew=275)
(1)a、b是康铜合金丝,c、d是镍铬合金丝,c的长度是其它三条的两倍,b的直径是其它三条的两倍,其他条件相同。该探究小组在实验前已经学习了电阻的相关知识,电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fade4e14bf5845ff14f9e95bb6bfef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40f1d184152aa3954752ed70e7d1612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a141aebf8837c681dbc5b63bb6bbf411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81786d0b87f12f1d08aa236b286b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd5f9ecb870fedb5b9a608d9ca2f911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f833a7beb83820ecede0234c671f1878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1121190db07ad1d64015a3dc4873d65d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9462363c4c5016291c8939f24784eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5b0b00f041cb2dc51aa0e8992dfd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c7bc14cad817364e69bff314e683e9.png)
(2)该小组研究了导体电阻与其影响因素的定量关系之后,想测定某金属丝电阻率,现有如下器材:
A.干电池两个(内阻忽略不计),导线若干,开关一个
B.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0303b4d79507a7b7c1dccaecaebff5ef.png)
C.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be2d79deda8cfad829b3b4698bc84e3.png)
D.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd5f9ecb870fedb5b9a608d9ca2f911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad53b547e11f3e4719a70a4b9564cc8.png)
E.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f833a7beb83820ecede0234c671f1878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94435abd92f9e157066cfb7f4e1b514.png)
F.待测电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493dfb76b4214b676a9f06f0be1f4b4e.png)
G.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c183718f7a66d748ab258ee5ee34d.png)
H.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1557049786dd01a422375b01bb23b728.png)
为使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/9b36841b-079c-495a-8a9a-e09c40e21a06.png?resizew=214)
(3)用刻度尺测出铜丝长度为L,用螺旋测微计测出铜丝直径如下图所示,则直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/f9d77ce1-4bbd-428b-b5dc-bde295cde115.png?resizew=386)
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适中
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【推荐2】某小组欲测量约为几欧的金属丝阻值,并利用金属丝改装电表。_________ (选填“-”、“0.6”或“3”)接线柱连接,b端应与电流表_________ (选填“-”、“0.6”或“3”)接线柱连接。开关闭合前,图1中滑动变阻器滑片应置于_______ (选填“左”或“右”)端。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
数据计算电阻,然后求电阻平均值;乙同学通过
图像求电阻。两种求电阻的方法更合理的是_________ (选填“甲”或“乙”)。
(2)该小组用镍铬丝(电阻率为
,横截面积为S)将满偏电流
、内阻为
的表头G改装成电流表。如图2所示,表头G两端并联长为L的镍铬丝,调节滑动变阻器使表头G满偏,记录毫安表示数为I。改变L,重复上述步骤,获得多组
数据,作出
图像如图3所示。则
图像斜率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
________ (用题中所给的字母表示)。若要把该表头G改装成量程为
的电流表,需要把长为________ m的镍铬丝并联在表头G两端(结果保留两位有效数字)。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6570fa2725860bad40296d475dd006b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e43cca5751eff3d24b64cb51006d6d7.png)
(2)该小组用镍铬丝(电阻率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171102a883b22fe6ca578efc8926f5b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc70e0f2329acdd7cf96fdca5287715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055559e8a1582de894070ddfcc647f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4376e7e96a54a6a133460668de562d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e15aed3fbd47724fc71e5f6f840ddb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e15aed3fbd47724fc71e5f6f840ddb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb063d7a4894d36a22d3b26ee0702e90.png)
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适中
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名校
【推荐3】某同学设计实验测定金属的电阻率,要求电压从零开始调节。用米尺测量金属丝的长度
,用螺旋测微器和游标卡尺分别测量金属丝的直径时的刻度如图甲、乙所示。
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844770934480896/2844940112674816/STEM/b0e4eb81-9cb7-42df-b3aa-ad55221dbec0.png?resizew=396)
金属丝的电阻大约为
,在用伏安法对金属丝进行进一步测定时,有如下供选择的实验器材:
直流电源:电动势
,内阻可不计;
电流表
:量程
,内阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0055db6cc2453dd4e5ce61f7dc1d4021.png)
电流表
:量程
,内阻
;
电压表
:量程
,内阻
;
滑动变阻器
:最大阻值
;
滑动变阻器
:最大阻值
;
开关、导线等。
(1)从甲中读出金属丝的直径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
________
;从乙中读出金属丝的直径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
______
;
(2)在所给的可供选择的器材中,应选的电流表是______ ,应选的滑动变阻器是_________ ;(填写仪器的字母代号)
(3)本实验应选择电流表______ 法(填“内接”或者“外接”),请从误差分析的角度简要说明原因:______________________________________________________ 。
(4)根据题目要求,在方框中补全实验电路图_______ :
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844770934480896/2844940112674816/STEM/92f9bd49-3626-4c8e-8fd6-b8f389d05d3b.png?resizew=165)
(5)根据(4)中电路图,补全实物图,要求:导线不能交叉______ ;
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844770934480896/2844940112674816/STEM/0d035d73-46a9-49bb-bcf3-82071a285ae2.png?resizew=228)
(6)用待测金属丝的电阻
、长度
以及直径
表示金属丝的电阻率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
_________ 。
(7)实验测出的电阻丝的电阻为
,根据测量数据,计算出这种金属材料的电阻率为_______
(
取3.14,小数点后保留两位)。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442257676ca155e57db46b636bd32845.png)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844770934480896/2844940112674816/STEM/b0e4eb81-9cb7-42df-b3aa-ad55221dbec0.png?resizew=396)
金属丝的电阻大约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27350fb8a4f514cfc4ea2ac48ed1ae2.png)
直流电源:电动势
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d8b94b084bbad77f6571673d8ccc19.png)
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf35aa115963656d885b6440d6caa2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd03792c2bb898cc9effd2dc4036869f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0055db6cc2453dd4e5ce61f7dc1d4021.png)
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e65b2e896a5c2371ef4d17d58d2709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2741ff508694d5665073f6ae313cca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0754c1fdc83f61abb0ae9dab54e8a98f.png)
电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478abdd84506a8ef759e353a238db6c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0c81d3bdfe9dd9fe420c382e8b91c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951f5dfc2ee88b950c0a4322d9236ce4.png)
滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4de49b9b4621a90d07ea99ae6c1cc75.png)
滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3124e592682ae8b7a39711b368d31e.png)
开关、导线等。
(1)从甲中读出金属丝的直径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6d85799453899836bc34ad276ec80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
(2)在所给的可供选择的器材中,应选的电流表是
(3)本实验应选择电流表
(4)根据题目要求,在方框中补全实验电路图
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844770934480896/2844940112674816/STEM/92f9bd49-3626-4c8e-8fd6-b8f389d05d3b.png?resizew=165)
(5)根据(4)中电路图,补全实物图,要求:导线不能交叉
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844770934480896/2844940112674816/STEM/0d035d73-46a9-49bb-bcf3-82071a285ae2.png?resizew=228)
(6)用待测金属丝的电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2581ae160692cd7e2686226fe5e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
(7)实验测出的电阻丝的电阻为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e67a8a6dcba24b5d9fce8355c7634fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04bd482c8aa483cd59b4c22636960fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
您最近一年使用:0次