当前位置:首页>学习笔记>【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第三章专题强化6电阻的其他测量方法

【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第三章专题强化6电阻的其他测量方法

  • 2026-03-24 10:39:30
【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第三章专题强化6电阻的其他测量方法

[学习目标] 1.进一步理解电流表内接法、外接法及滑动变阻器的限流式接法和分压式接法,并能在具体问题中正确选择(重难点)。2.会用伏伏法、安安法、等效替代法及半偏法测电阻(重难点)。

一、等效替代法测电阻

如图所示,先让待测电阻与一电流表串联后接到输出电压恒定的电源上,使电流表示数为I;然后将电阻箱与电流表串联后接到同一电源上,调节电阻箱的阻值,使电流表的示数仍为I,则电阻箱的读数等于待测电阻的阻值。

说明:等效替代法的实验原理简单,看似没有系统误差,但考虑到电阻箱不能连续调节,往往很难保证电流表的读数不变。

 某同学用如图甲所示的电路测量未知电阻Rx的阻值。

(1)请用笔画线代替导线,按电路图甲完成实物图乙的连接。

(2)根据电路图甲,闭合开关S1前,滑动变阻器的滑片应在最______(填)端。闭合开关S1后,将开关S2a,调节滑动变阻器R1,使毫安表的示数为I

(3)保持滑动变阻器的滑片不动,将开关S2b,调节电阻箱,使____,记录此时电阻箱的阻值R0

(4)未知电阻的阻值Rx=______,测量值________(选填大于”“等于小于)真实值。

二、伏伏法测电阻

伏伏法又称电压表差值法,是利用两个电压表的组合测量电压表的内阻或其他电阻的方法。常见电路如图甲、乙所示。

(1)条件:电压表V2的量程必须大于电压表V1的量程且能搭配使用。

(2)技巧:已知内阻的电压表可当作电流表使用。在缺少合适的电流表的情况下,常用电压表代替电流表使用。

(3)原理:以图甲为例,电压表V1、V2的读数分别为U1U2,根据电路知识有U2U1U1r1R0,则如果R0已知,可求出电压表的内阻r1U1U2-U1R0;如果r1已知,可以求出R0U2-U1U1r1

(2023·广州市第七中学高二期中)在测量定值电阻阻值的实验中,提供的实验器材如下:电压表V1(量程3 V,内阻r1=3.0 kΩ),电压表V2(量程5 V,内阻r2=5.0 kΩ),滑动变阻器R(额定电流1.5 A,最大阻值100 Ω),待测定值电阻Rx,电源E(输出电压6.0 V),开关和导线若干。

回答下列问题:

(1)将虚线框中的电路原理图补充完整。

(2)根据表中的实验数据(U1U2分别为电压表V1、 V2的示数),在图中给出的坐标纸上绘制U2U1图像。

测量次数

1

2

3

4

5

U1/ V

1.00

1.50

2.00

2.50

3.00

U2/ V

1.61

2.41

3.21

4.02

4.82

(3)由U2U1图像得到待测定值电阻的阻值Rx=________ Ω(结果保留三位有效数字)。

三、安安法测电阻

安安法又称电流表差值法,是利用两个电流表的组合测量电流表的内阻或其他电阻的方法,常见电路如图甲、乙所示。

(1)条件:电流表A2的量程必须大于电流表A1的量程且能搭配使用。

(2)技巧:已知内阻值的电流表可当作电压表使用。在缺少合适的电压表的情况下,常用电流表代替电压表使用。

(3)原理:电流表A1、A2的读数分别为I1I2,电流表A1的内阻为r1,则以图甲为例,根据电路知识有I1(r1R0)=(I2I1)Rx,则如果r1R0已知,可求出Rx的阻值;如果R0Rx已知,可以求出电流表A1的内阻r1I2-I1I1RxR0

 用以下器材测量待测电阻Rx的阻值:

A.待测电阻Rx,阻值约为200 Ω

B.电源E,输出电压约为3.0 V

C.电流表A1,量程为0~10 mA,内电阻r1=20 Ω

D.电流表A2,量程为0~20 mA,内电阻r2约为8 Ω

E.定值电阻R0,阻值R0=80 Ω

F.滑动变阻器R1,最大阻值为10 Ω

G.滑动变阻器R2,最大阻值为200 Ω

H.单刀单掷开关S,导线若干

(1)为了测量电阻,你认为应选择图中的______图作为实验电路(选填”“)。

(2)滑动变阻器应该选________(选填R1R2);在闭合开关前,滑动变阻器的滑片P应置于________(选填ab)端。

(3)调节滑动变阻器,直到__________(选填A1A2)先达到满偏,此时另一个电表的示数刚好达到满偏的45,由此可确定待测电阻为______ Ω(结果保留三位有效数字)。

通过网盘分享的文件:word讲义

链接: https://pan.baidu.com/s/1JYC12PUPGPNazMlYWE5hgQ?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000661s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000908s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009112s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000188s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000520s ]
  8. SELECT * FROM `article` WHERE `id` = 477094 LIMIT 1 [ RunTime:0.004817s ]
  9. UPDATE `article` SET `lasttime` = 1774419185 WHERE `id` = 477094 [ RunTime:0.013350s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000252s ]
  11. SELECT * FROM `article` WHERE `id` < 477094 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000460s ]
  12. SELECT * FROM `article` WHERE `id` > 477094 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000411s ]
  13. SELECT * FROM `article` WHERE `id` < 477094 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000718s ]
  14. SELECT * FROM `article` WHERE `id` < 477094 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000679s ]
  15. SELECT * FROM `article` WHERE `id` < 477094 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000776s ]
0.100686s