当前位置:首页>学习笔记>【26版步步高物理人教版必修三学习笔记第十一章3第1课时串联电路和并联电路滑动变阻器的两种接法

【26版步步高物理人教版必修三学习笔记第十一章3第1课时串联电路和并联电路滑动变阻器的两种接法

  • 2026-02-25 06:41:39
【26版步步高物理人教版必修三学习笔记第十一章3第1课时串联电路和并联电路滑动变阻器的两种接法

n

3 串联电路和并联电路

第1课时 串联电路和并联电路 滑动变阻器的两种接法

[学习目标] 1.掌握串、并联电路的电流、电压和电阻关系,并能进行有关计算(重点)。2.理解滑动变阻器的两种接法,并能正确选择(难点)。

一、串联电路和并联电路

1.串联电路:把几个导体或用电器依次首尾连接,接入电路的连接方式,如图甲所示。

2.并联电路:把几个导体或用电器的一端连在一起,另一端也连在一起,再将两端接入电路的连接方式,如图乙所示。

3.串联电路、并联电路的特点

串联电路

并联电路

电流关系

各处电流相等,即II1I2In

总电流等于各支路电流之和,即II1I2In

电压关系

总电压等于各部分电压之和,即UU1U2Un

各支路两端电压相等,即UU1U2Un

电阻关系

总电阻等于各部分电阻________,即R=______________

总电阻的倒数等于各支路电阻的_______,即1R=________________

1.n个相同电阻(R1)串联或并联,其总电阻分别为多少?

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2.并联电路中,若某一电阻增大,总电阻如何变化?若增加一支路,总电阻如何变化?

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3.R1R2并联后的总电阻与其中任一支路的电阻的阻值有什么关系?若R1远大于R2,总电阻R有何规律?

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(1)电路中电阻的个数越多,电路的总电阻越大。(  )

(2)无论是串联电路还是并联电路,只要其中一个电阻增大,总电阻就增大。(  )

(2024·普宁市高二期中)阻值分别为R1R2R3的电阻串联在电路中。已知R1=10 Ω、R3=5 Ω,R1两端的电压为6 V,R2两端的电压为12 V,则(  )

A.电路中的电流为0.6 A

B.R2为15 Ω

C.三只电阻两端的总电压为20 V

D.R3两端的电压为4 V

已知R1=10 Ω,R2=20 Ω,R1允许通过的最大电流为1.5 A,R2两端允许加的最大电压为10 V。若将它们串联,加在电路两端的最大电压是(  )

A.45 VB.5 VC.25 VD.15 V

如图所示电路中,已知R1=5 Ω,R2=12 Ω,电压表示数为2 V,电流表示数为0.2 A,求:

(1)电阻R3的阻值;

(2)AC两端的电压值。

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1串联电路中各电阻两端的电压跟它们的阻值成正比,即U1R1U2R2UnRnUR总IU1U2U3UnR1R2R3Rn

2.并联电路中通过各支路电阻的电流跟它们的阻值成反比,即I1R1I2R2InRnIRUI1I2I3In1R11R21R31Rn

二、滑动变阻器的两种接法

1.两种接法的特点

限流式接法

分压式接法

电路图(图中R为负载电阻,R0为滑动变阻器)

滑动变阻器与测量电阻串联

滑动变阻器一部分与测量电阻并联之后,再与滑动变阻器另一部分电阻串联

滑动变阻器接入电路的特点

采用一上一下的接法

采用一上两下的接法

闭合开关前滑片位置

应在最______端,即保证滑动变阻器接入电路中的阻值最________

应在最________端,即开始时R两端电压为______

通过R的电流范围

UR0+RUR

0~UR

R两端的电压范围

RR0+RUU

优点

电路连接简单,耗电少

R的电压调节范围大

2.两种接法的适用条件

(1)限流式接法适合测量阻值较小的电阻(与滑动变阻器的总电阻相当)。由于R小,限流式接法中滑动变阻器分得的电压大,移动滑片调节范围大。

(2)分压式接法适合测量阻值较大的电阻(比滑动变阻器的总电阻大)。若R很大,分压式接法中R几乎不影响电压的分配,移动滑片电压变化明显,便于调节。

(3)以下几种情况必须采用分压式接法

要求电压表能从零开始读数,要求电压(电流)测量范围尽可能大;

当待测电阻RR0(滑动变阻器的最大阻值)时(限流式接法滑动变阻器几乎不起作用);

若采用限流式接法,电路中的最小电流仍超过电路中电表、电阻允许的最大电流。

(4)在两种电路均可使用的情况下,应优先采用限流式接法,因为限流式接法电路简单,能耗低。

(多选)滑动变阻器的原理如图所示,则下列说法中正确的是(  )

A.若仅将ac两端连在电路中,则当滑片OP向右滑动时,滑动变阻器接入电路中的阻值增大

B.若仅将ad两端连在电路中,则当滑片OP向右滑动时,滑动变阻器接入电路中的阻值减小

C.将滑动变阻器以限流式接法接入电路时,必须连入三个接线柱

D.将滑动变阻器以分压式接法接入电路时,必须连入三个接线柱

如图所示,滑动变阻器R1的最大阻值是200 Ω,R2=300 Ω,AB两端电压UAB=8 V。

(1)当S断开时,移动滑片P,R2两端可获得的电压变化范围是多少?

(2)当S闭合时,移动滑片P,R2两端可获得的电压变化范围是多少?

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通过网盘分享的文件:同步PPT课件等3个文件

链接: https://pan.baidu.com/s/1_GzpLu1fXgm2Lbs2dUxo2A?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000594s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000890s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000489s ]
  6. SELECT * FROM `set` [ RunTime:0.000174s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 470223 LIMIT 1 [ RunTime:0.010899s ]
  9. UPDATE `article` SET `lasttime` = 1771978739 WHERE `id` = 470223 [ RunTime:0.000680s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000285s ]
  11. SELECT * FROM `article` WHERE `id` < 470223 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000405s ]
  12. SELECT * FROM `article` WHERE `id` > 470223 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000551s ]
  13. SELECT * FROM `article` WHERE `id` < 470223 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001061s ]
  14. SELECT * FROM `article` WHERE `id` < 470223 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001051s ]
  15. SELECT * FROM `article` WHERE `id` < 470223 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007358s ]
0.093189s