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培优讲义第三章作业18导体的I-U特性曲线

【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第三章作业18导体的I-U特性曲线

  • 2026-03-28 18:55:06
【2026版高中物理粤教版必修三册学习笔记练透word培优讲义第三章作业18导体的I-U特性曲线

18导体的IU特性曲线

[分值:100分]

1~9题每题7分,共63分

考点一 电流

1.下列说法正确的是(  )

A.导体中电荷运动就形成了电流

B.只有自由电子的定向移动才能形成电流

C.导体中的自由电荷越多,电流越大

D.电源的作用是使电源的正、负极两端保持一定的电势差

2.通过甲、乙两导线横截面的电荷量之比为35,甲、乙两导线通电时间之比为32,则通过甲、乙两导线的电流之比为(  )

A.15B.25

C.52D.51

考点二 电流的微观表达式

3.有甲、乙两导体,甲的横截面积是乙的2倍,而单位时间内通过乙导体横截面的电荷量是甲的2倍,以下说法正确的是(  )

A.通过甲、乙两导体的电流相同

B.通过乙导体的电流是甲导体的2倍

C.乙导体中自由电荷定向移动的速率是甲导体的2倍

D.甲、乙两导体中自由电荷定向移动的速率相等

4.(2024·广州市高二月考)在显像管的电子枪中,从炽热的金属丝不断放出的电子进入电压为U的加速电场,设其初速度为零,经加速后形成横截面积为S、电流为I的电子束。已知电子的电荷量为e、质量为m,则在刚射出加速电场时,一小段长为Δl的电子束内的电子个数是(  )

A.IΔleSm2eU)B.IΔlem2eU)

C.IeSm2eU)D.ISΔlem2eU)

考点三 欧姆定律

5.(多选)(2024·深圳市高二月考改编)对于欧姆定律的理解,下列说法中正确的是(  )

A.由IUR可知通过电阻的电流跟它两端的电压成正比,跟它的电阻成反比

B.由UIR可知对一定的导体,通过它的电流越大,它两端的电压也越大

C.电流相同时,电阻越大,则电阻两端电压越小

D.对一定的导体,它两端的电压与通过它的电流的比值保持不变

6.两个阻值分别为R1R2的定值电阻,现将两电阻分别接在不同的电压U1U2两端,已知R1=2R2U2=2U1,则关于流过两电阻的电流I1I2的关系正确的是(  )

A.I1=2I2B.I1I22

C.I1I2D.I1I24

考点四 导体的IU特性曲线

7.(多选)如图所示,ABC为三个通电导体的IU关系图像。由图可知(  )

A.三个导体的电阻关系为RARBRC

B.三个导体的电阻关系为RARBRC

C.若在导体B两端加上10 V的电压,通过导体B的电流是2.5 A

D.若在导体B两端加上10 V的电压,通过导体B的电流是40 A

8.(2024·广州市高二期末)如图所示为某金属导体的伏安特性曲线,MN是曲线上的两点,过M点的切线和MN两点对应坐标图中已标出,下列说法正确的是(  )

A.该金属导体的电阻随电压的增大而减小

B.该金属导体两端的电压是2.0 V时对应的电阻是6.7 Ω

C.该金属导体的电阻是10 Ω

D.该金属导体在M点和N点对应的电阻之比是32

9.(2023·东莞市常平中学高二期中)某一导体的伏安特性曲线如图中AB段(曲线)所示,关于导体的电阻,以下说法正确的是(  )

A.在B点时的电阻为12 Ω

B.在B点时的电阻为40 Ω

C.导体的电阻因温度的影响改变了1 Ω

D.导体的电阻因温度的影响改变了9 Ω

10~11题每题11分,共22分

10.(多选)(2023·汕尾市高二期末)安培提出了著名的分子电流假说,根据这一假说,电子绕核运动可等效为一环形电流。电荷量为e、质量为m的电子以速率v绕原子核沿顺时针方向做半径为r的匀速圆周运动。静电力常量用k表示。则下列说法正确的是(  )

A.电子受到的库仑力为mv2r

B.原子核所带的电荷量为mv2ke

C.分子电流大小为ev2πr

D.分子电流沿逆时针方向流动

11.abcd四个电阻的伏安特性曲线如图所示,则下列说法中正确的是(  )

A.ab两个电阻阻值恒定,Ra>Rb

B.随电压的升高,cd两个电阻阻值变化,且Rd变大

C.若b电阻图线与U轴夹角为α,则Rb1tan α

D.若cd图线交点的切线与U轴夹角为β,则Rc1tan β

(15分)

12.如图所示的电路,电源电压保持不变,电阻R1=10 Ω,R2=8 Ω,当闭合开关S1断开S2时,电流表A1的读数为0.2 A,则当闭合开关S2断开S1时,电流表A2的读数可能为(  )

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  1. CONNECT:[ UseTime:0.000377s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000506s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000267s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000572s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000572s ]
  8. SELECT * FROM `article` WHERE `id` = 478458 LIMIT 1 [ RunTime:0.000440s ]
  9. UPDATE `article` SET `lasttime` = 1774738905 WHERE `id` = 478458 [ RunTime:0.001300s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000212s ]
  11. SELECT * FROM `article` WHERE `id` < 478458 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000387s ]
  12. SELECT * FROM `article` WHERE `id` > 478458 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000328s ]
  13. SELECT * FROM `article` WHERE `id` < 478458 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001432s ]
  14. SELECT * FROM `article` WHERE `id` < 478458 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000728s ]
  15. SELECT * FROM `article` WHERE `id` < 478458 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001148s ]
0.077254s