在“探究决定导线电阻的因素”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L,金属丝的电阻大约为5 Ω,先用伏安法测出金属丝的电阻R,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/2021/2/22/2663567113068544/2664207232614400/STEM/705f1c0e-1dec-45a9-a913-cc859a56ce15.png?resizew=111)
(1)从图中读出金属丝的直径为______ mm;
(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0~3 V,内阻约10 kΩ B.电压表0~15 V,内阻约50 kΩ
C.电流表0~0.6 A,内阻约0.05 Ω D.电流表0~3 A,内阻约0.01 Ω
E.滑动变阻器0~10 Ω F.滑动变阻器0~1000Ω
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______ 。填序号)
![](https://img.xkw.com/dksih/QBM/2021/2/22/2663567113068544/2664207232614400/STEM/705f1c0e-1dec-45a9-a913-cc859a56ce15.png?resizew=111)
(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0~3 V,内阻约10 kΩ B.电压表0~15 V,内阻约50 kΩ
C.电流表0~0.6 A,内阻约0.05 Ω D.电流表0~3 A,内阻约0.01 Ω
E.滑动变阻器0~10 Ω F.滑动变阻器0~1000Ω
①要求较准确地测出其阻值,电压表应选
更新时间:2021-02-23 12:46:24
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【知识点】 测量电阻丝电阻率的实验电路、实验步骤和注意事项
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【推荐1】在“导体电阻率的测量”实验中
(1)某同学利用______ (选填“刻度尺”“秒表”)测得圆柱形金属丝接入电路的有效长度为
,利用螺旋测微器测得其直径为
。
(2)某次测量得到这段金属丝两端电压如图所示,电压表的量程
,读得电压![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15fa22efc54f77da4a17374ca8ab67d0.png)
______ V(选填“2.60”“13.0”)。测出多组电压、电流值,通过
图像的斜率求得______ (选填“电阻R”“速度v”);______ (选填“偶然误差”“系统误差”),将R、l和d的测量值代入公式
可计算出该金属丝所用材料的电阻率。
(1)某同学利用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1bb6d1f9c3b2c534b0c45632b3a4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7552cd75e7efc6db510d7fa07ecad209.png)
(2)某次测量得到这段金属丝两端电压如图所示,电压表的量程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6bb65878785532d817f8fd11a9ef3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15fa22efc54f77da4a17374ca8ab67d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d92b43140823907fef60fc84875c88.png)
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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】在“测定金属丝的电阻率”的实验中,待测电阻丝阻值约为
.
用螺旋测微器测量电阻丝的直径d.其中一次测量结果如图所示,图中读数为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
______ mm.
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156758859841536/2210706487189504/STEM/793b5f59-ca7d-4adf-9f9f-39ae0e2bf01e.png?resizew=160)
用毫米刻度尺测量金属丝接入电路的长度L.
为了测量电阻丝的电阻R,除了导线和开关外,还有以下一些器材可供选择:
A.电源
电动势为
,内阻不计![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
B.电压表
量程为
,内阻约为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15f5c1df99505a3ba19c741f7fba835.png)
C.电流表
量程为
,内阻约为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13468c7dcddd641b6f9d0d108aa082f.png)
D.滑动变阻器
最大阻值
,额定电流![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea124513763d7035f0302b32d1bb897.png)
E.开关S一个,导线若干
请在下图的方框图内画出测量电阻丝的电阻应采用的电路图_____ .
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156758859841536/2210706487189504/STEM/635781ef-1057-4671-9350-1d04971cd04b.png?resizew=203)
在实验中,电压表示数为U,电流表示数为I,则金属丝电阻率的表达式为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30db97c39edcede2f0e7d4e075fecec.png)
______ ;
用直接测量的物理量表示
,从系统误差上看,金属丝电阻率的测量偏比真实值______
填“大”或“小”
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d7fe422e1ff6f96d365e8c08c32eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156758859841536/2210706487189504/STEM/793b5f59-ca7d-4adf-9f9f-39ae0e2bf01e.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0c12379ff58d8ddf66547d7a873baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a416e351c08669214734418cf60209e.png)
A.电源
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8a65fcb0beeca45f72f11e23a1d182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28558ec5e1987f35560bf301b102183f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
B.电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aed5d212456939bc2c11bd0be9c6bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432bac0e6ef0ab28f33a76c2272ba24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15f5c1df99505a3ba19c741f7fba835.png)
C.电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865e0d247669913dcdb7e9c513b3f9e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ceed45716c68e50c2a1438c255efa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13468c7dcddd641b6f9d0d108aa082f.png)
D.滑动变阻器
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6da4c2a192984a52111cd77138009e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78aa8e890d2ac882e0fe79598811777a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea124513763d7035f0302b32d1bb897.png)
E.开关S一个,导线若干
请在下图的方框图内画出测量电阻丝的电阻应采用的电路图
![](https://img.xkw.com/dksih/QBM/2019/3/9/2156758859841536/2210706487189504/STEM/635781ef-1057-4671-9350-1d04971cd04b.png?resizew=203)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98ba1c10689c2a883327fa85f89a083.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
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