某同学利用图甲所示的电路测定定值电阻R0的阻值以及电源的电动势E和内电阻r。调节滑动变阻器的滑动触头P,记录电流表A、电压表V1和电压表V2的测量数据,并根据数据描绘了图乙所示的两条U-I直线。(已知电流表内阻为
,电压表内阻均足够大)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f604955b-8678-4303-8887-f9d7d123b405.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/50e01627-594f-4cc1-a6c0-84e95ce1634a.png?resizew=408)
(1)某次测量电压表示数如图丙所示,则该表读数为________ V;
(2)根据图乙,电源电动势E=_________ V,内电阻r=________ Ω,定值电阻的阻值为R0=________ Ω;(结果保留两位有效数字)
(3)若将定值电阻R0直接接到该电源的两极,则该电阻消耗的电功率为_________ W。(结果保留两位有效数字)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c912ae98229470e24ffc9c791a50be40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f604955b-8678-4303-8887-f9d7d123b405.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/50e01627-594f-4cc1-a6c0-84e95ce1634a.png?resizew=408)
(1)某次测量电压表示数如图丙所示,则该表读数为
(2)根据图乙,电源电动势E=
(3)若将定值电阻R0直接接到该电源的两极,则该电阻消耗的电功率为
2022·广西·一模 查看更多[3]
更新时间:2022-11-24 16:13:28
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【知识点】 测量电源电动势和内阻的实验步骤和数据处理
相似题推荐
实验题
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(0.65)
名校
【推荐1】在测量一节干电池的电动势和内阻的实验中,由于电流表和电压表内阻的影响,测量结果会存在系统误差;要尽可能准确地测量电池的电动势和内阻。
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992053421064192/2992593848360960/STEM/aff389e0-6db8-40f2-ac62-f56563562e2d.png?resizew=406)
(1)实验电路图应选择图_______ (填“甲”或“乙”)。
(2)应选用的电流表是_________ ,应选用的电压表是______ (填器材代号)。
电流表
:量程
,内阻
约为
;
电流表
:量程
,内阻
约为
;
电压表
:量程
,内阻
约为
;
电压表
:量程
,内阻
约为
;
(3)根据实验中电流表和电压表的示数得到了如图丙所示的
图像,则干电池的电动势![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
______ V,内阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
______
。
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992053421064192/2992593848360960/STEM/aff389e0-6db8-40f2-ac62-f56563562e2d.png?resizew=406)
(1)实验电路图应选择图
(2)应选用的电流表是
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024e2379c58191758f8bd7602a6bcb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9d332743ec267382cd99600b757cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b577465edb567825864e491d4923d8a.png)
电流表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34a75c2a392f235c5f07b91d9fb58d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5c929172bbfc21741fa7ef1f53b7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c900495736982c251da7b4919cdf59.png)
电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fade4e14bf5845ff14f9e95bb6bfef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d844f1fc1d0388e1cec99d68f50ccbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2cb48c0a69b8c420c0b64b2bfa1ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b8489b17608927e9ba3f6d2da1f16.png)
电压表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40f1d184152aa3954752ed70e7d1612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f3f8c46a613a13581498f6a65f943a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4804e9b295d3b8de7f05e9c4e8e30a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b83e1d413d48afddd05d9b6b182815.png)
(3)根据实验中电流表和电压表的示数得到了如图丙所示的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e43cca5751eff3d24b64cb51006d6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
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实验题
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(0.65)
【推荐2】实验桌上有下列实验仪器:
A、待测电源一个(电动势约3V,内阻约2Ω)
B、直流电流表(量程
,内阻约
)
C、直流电流表(量程
,内阻约
)
D、直流电压表(量程
,内阻约15kΩ)
E、滑动变阻器(阻值范围为
,允许最大电流为1A)
F、滑动变阻器(阻值范围为
,允许最大电流为1A)
G、开关、导线若干
请你解答下列问题:
(1)你选择的直流电流表是________ ;你选择的滑动变阻器是________ 。(填代号)。
(2)某同学根据测出的数据,作出
图线如图所示,则由图像可得所测电源的电动势![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
_____ V,内电阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
_______ Ω。
A、待测电源一个(电动势约3V,内阻约2Ω)
B、直流电流表(量程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5c929172bbfc21741fa7ef1f53b7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3167be4061247e72959f0631ed3be99.png)
C、直流电流表(量程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9d332743ec267382cd99600b757cd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0303b4d79507a7b7c1dccaecaebff5ef.png)
D、直流电压表(量程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6bb65878785532d817f8fd11a9ef3d.png)
E、滑动变阻器(阻值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c138b79256e27d25ef994a452801219.png)
F、滑动变阻器(阻值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0659da9e6ba286b42d8b0986d0c81e9a.png)
G、开关、导线若干
请你解答下列问题:
(1)你选择的直流电流表是
(2)某同学根据测出的数据,作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e43cca5751eff3d24b64cb51006d6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/8926bcbd-88ba-4935-8601-ab183d11f48d.png?resizew=169)
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【推荐3】某同学欲测定两节相同干电池的电动势和内电阻,可供选择的器材如下:
A.每节干电池的电动势约
,内阻约![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f2ab37e0853e3f1ec3826280b0c9ff.png)
B.电压表V,量程为
,内阻很大
C.电流表A,量程为
,内阻为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477145440d1f6595852e364d904fff50.png)
D.滑动变阻器R,最大阻值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328f43fb52adbae560ad124e3297e947.png)
E.定值电阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686d35989b1a13eba4b862a5aa08ee58.png)
F.总阻值为
的电阻箱
G.导线若干,开关
(1)该同学发现电流表的量程太小,他欲把该电流表改装成量程为
的电流表,他把电阻箱与电流表A并联,且应把阻值调为_________
。
(2)改装电流表后,他设计了如图所示的电路进行测量,老师指出了他该电路的一处错误,这处错误是__________________ ,在只改动一根导线的情况下,改进办法是__________________ 。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/86965208-2f60-478e-be21-edd95f40ff8d.png?resizew=226)
(3)正确连接后,调节滑动变阻器得到了两组电流表与电压表的示数。读得两组数据为(
),(
),其中电流表的读数为改表后的读数,由以上数据可求得一节干电池的电动势![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
_________ V、内阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
_________
(结果均保留2位小数)。
A.每节干电池的电动势约
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6ec06bd32883db9b4ea250b06d4313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f2ab37e0853e3f1ec3826280b0c9ff.png)
B.电压表V,量程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6138d79e080d6a9db9066916ca409f0c.png)
C.电流表A,量程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda42a275071ca18fb9702761f9169d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477145440d1f6595852e364d904fff50.png)
D.滑动变阻器R,最大阻值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328f43fb52adbae560ad124e3297e947.png)
E.定值电阻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686d35989b1a13eba4b862a5aa08ee58.png)
F.总阻值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6743675e3d1117259cdd0b379e3c1d6f.png)
G.导线若干,开关
(1)该同学发现电流表的量程太小,他欲把该电流表改装成量程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45af90ee381e0a653d615515bd55005f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
(2)改装电流表后,他设计了如图所示的电路进行测量,老师指出了他该电路的一处错误,这处错误是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/86965208-2f60-478e-be21-edd95f40ff8d.png?resizew=226)
(3)正确连接后,调节滑动变阻器得到了两组电流表与电压表的示数。读得两组数据为(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5550921478fc59bd5e7b8794d6124749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01116bb7e025484e06ac71854d5351a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a10353eb53b3fbac1a0c0734d95f0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258e40e3883271c3580c1d3c805dcac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
您最近一年使用:0次