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第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义

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第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义
第10章实验12 用多用电表测量电学中的物理量_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_大一轮复习讲义

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实验十二 用多用电表测量电学中的物理量 目标要求 1.了解多用电表的构造和工作原理.2.会用多用电表测量电压、电流.3.测量定值 电阻和判断二极管的正负极.4.会用多用电表进行简单的电路故障分析. 实验技能储备 1.认识多用电表 (1)多用电表可以用来测量电流、电压、电阻等,并且每一种测量项目都有几个量程. (2)外形如图所示:上半部分为表盘,表盘上有电流、电压、电阻等多种量程的刻度;下半 部分为选择开关,它的四周刻有各种测量项目和量程. 多用电表面板上还有:欧姆表的欧姆调零旋钮(使电表指针指在右端零欧姆处)、指针定位螺 丝(使电表指针指在左端的“0”位置)、表笔的正、负插孔(________表笔插入“+”插孔, ________表笔插入“-”插孔). 2.用多用电表测量小灯泡的电压和电流 按如图甲所示的电路图连好电路,将多用电表选择开关置于________________挡,测小灯泡 两端的电压.红表笔接电势________(填“高”或“低”)的点. 按如图乙所示的电路图连好电路,将选择开关置于________________挡,测量通过小灯泡的 电流.此时电流从________色表笔流入电表. 3.用多用电表测定值电阻的阻值 (1)原理电路图 相当于待测电阻R=0, x 相当于待测电阻R x = 待测电阻为R x ,I=, I与R 的 调节R使I=I=,此时 x g ∞,此时I=0,指针 指针指到某确定位置, 对应关系 指针指在I 处(R =R+r g Ω g 不偏转 此时R=-R x Ω +R) 表头电流I=0处,对 表头电流I与电阻R 一 x 表头电流满偏I 处,对 g 刻度特点 应欧姆表∞刻度(最左 一对应,但不是线性关 应欧姆表零刻度(最右侧) 侧) 系,表盘刻度不均匀 (2)注意:①黑表笔与电源的正极连接,红表笔与电源的负极连接,电流方向为“红进黑 出”. ②当多用电表指针指在中央时=,知中值电阻R =R . 中 Ω (3)测量步骤 ①估测待测电阻阻值,选择合适的量程. ②欧姆调零. ③将被测电阻接在红黑表笔之间. ④读数:指针示数乘以倍率. ⑤使用完毕:选择开关置于________________,长期不用应取出电池. (4)注意事项 ①区分“机械零点”与“欧姆零点”.机械零点是表盘刻度________侧的“0”位置,机械 调零对应的是表盘下边中间的指针定位螺丝;欧姆零点是指刻度盘________侧的“0”位置, 欧姆调零对应的是欧姆调零旋钮. ②使指针指在中值附近,否则换挡. ③测电阻时每换一次挡必须重新__________. ④手不能接触表笔的金属杆. ⑤测量电阻时待测电阻要与其他元件和________断开. 4.用多用电表测二极管的正、反向电阻 (1)认识二极管:晶体二极管由半导体材料制成,它的符号如图所示,左端为正极,右端为 负极.特点:当给二极管加正向电压时电阻________,当给二极管加反向电压时电阻________. (2)用欧姆挡判断二极管的正负极 将多用电表欧姆挡调零之后,若多用电表指针偏角很大,则黑表笔接触二极管的________极, 红表笔接触二极管的________极(如图甲);若多用电表指针偏角很小,则黑表笔接触二极管 的________极,红表笔接触二极管的________极(如图乙). 5.探索黑箱内的电学元件 判断目的 应用挡位 现象 电源 电压挡 两接线柱正、反接时均无示数,说明无电源 电阻 欧姆挡 两接线柱正、反接时示数相同 二极管 欧姆挡 正接时示数很小,反接时示数很大 考点一 教材原型实验 考向1 多用电表原理及读数 例1 图(a)为某同学组装完成的简易多用电表的电路图.图中E是电池;R、R、R、R 和 1 2 3 4 R 是固定电阻,R 是可变电阻;表头 的满偏电流为250 μA,内阻为480 Ω.虚线方框内为 5 6 换挡开关,A端和B端分别与两表笔相连.该多用电表有5个挡位,5个挡位为:直流电压 1 V挡和5 V挡,直流电流1 mA挡和2.5 mA 挡,欧姆×100 Ω挡. (1)图(a)中的A端与________(填“红”或“黑”)色表笔相连接.(2)关于R 的使用,下列说法正确的是________(填正确答案标号). 6 A.在使用多用电表之前,调整R 使电表指针指在表盘左端电流“0”位置 6 B.使用欧姆挡时,先将两表笔短接,调整R 使电表指针指在表盘右端电阻“0”位置 6 C.使用电流挡时,调整R 使电表指针尽可能指在表盘右端电流最大位置 6 (3)根据题给条件可得R+R=____________Ω,R=________Ω. 1 2 4 (4)某次测量时该多用电表指针位置如图(b)所示.若此时B端是与“1”相连的,则多用电表 读数为__________;若此时B端是与“3”相连的,则读数为________;若此时B端是与 “5”相连的,则读数为____________.(结果均保留3位有效数字) 考向2 欧姆表的使用 例2 (2022·湖南卷·12)小梦同学自制了一个两挡位(“×1”“×10”)的欧姆表,其内部结 构如图所示,R 为调零电阻(最大阻值为R ),R、R 、R 为定值电阻(R+R
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  1. CONNECT:[ UseTime:0.001021s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001565s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007461s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007953s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001532s ]
  6. SELECT * FROM `set` [ RunTime:0.018904s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001546s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373460 LIMIT 1 [ RunTime:0.006660s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373460 [ RunTime:0.011904s ]
  10. UPDATE `wendang` SET `lasttime` = 1773118235 WHERE `id` = 373460 [ RunTime:0.003149s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373460 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009117s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373460 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003288s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373460 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013306s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373460 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007791s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373460 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006683s ]
0.274245s