2022年恒定电流实验总结上课讲义 .pdf

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1、恒 定 电 流 实 验 总 结精品文档收集于网络，如有侵权请联系管理员删除实验测定金属的电阻率一、螺旋测微器1.构造如图所示是常用的螺旋测微器，它的测砧A和固定刻度 G 固定在框架 F 上，旋钮K、微调旋钮 K和可动刻度 H，测微螺杆 P连在一起，通过精密螺纹套在G上.2.原理精密螺纹的螺距是0.5mm，即K每旋转一周，P前进或后退0.5mm，可动刻度分成50 等份，每一等份表示0.01mm，即可动刻度每转过一等份，P前进或后退0.01mm.因此，从可动刻度旋转了多少个等份就知道长度变化了多少个0.01mm.用它测量长度，可以精确到 0.01 mm，还可以 估读到 0.001mm(即毫米的千分

2、位)，因此螺旋测微器又称为千分尺.3.读数方法先从固定刻度G上读出半毫米整数倍的部分，不足半毫米的部分由可动刻度读出，即看可动刻度上的第几条刻度线与固定刻度线上的横线重合，从而读出可动刻度示数(注意估读).即有：测量长度=固定刻度示数+可动刻度示数精确度.(注意单位为 mm)如图所示，不足半毫米而从可动刻度上读的示数为15.5格，最后的读数为：2.155mm 4.注意事项(1)测量前须校对零点：先使小砧A与测微螺杆P并拢，观察可动刻度的零刻度线与固定刻度的轴向线是否重合，以及可动刻度的边缘与固定刻度的零刻度线是否重合，否则应加以修正.(2)读数时，除注意观察毫米整数刻度线外，还要特别注意半毫米

3、刻度线是否露出.螺旋测微器要估读，以毫米为单位时要保留到小数点后第三位.(3)测量时，当螺杆P快要接触被测物体时，要停止使用粗调旋钮K，改用微调旋钮K，当听到“咔、咔”响声时，停止转动微调旋钮K，并拧紧固定旋钮.这样做既可保护仪器，又能保证测量结果的准确性.二、游标卡尺1构造：如图实14 所示，主尺、游标尺(主尺和游标尺上各有一个内外测量爪)，游标尺上还有一个深度尺，尺身上还有一个紧固螺钉2用途：测量厚度、长度、深度、内径、外径3原理：利用主尺的最小分度与游标尺的最小分度的差值制成不管游标尺上有多少个小等分刻文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文

4、档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN

5、7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W

6、1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT

7、1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3

8、B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4

9、ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H

10、1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7精品文档收集于网络，如有侵权请联系管理员删除度，它的刻度部分的总长度比主尺上的同样多的小等分刻少1 mm.常见的游标卡尺的游标尺上小等分刻度有10 个的、20 个的、50个的，见下表：刻度格数(分度)刻度总长度差值精确度(可准确到)10 9mm 0.1m

11、m 0.1mm 20 19mm 0.1mm 0.05mm 50 49mm 0.2mm 0.02mm 4读数：若用x表示由主尺上读出的整毫米数，K表示从游标尺上读出与主尺上某一刻线对齐的游标的格数，则记录结果表达为(xK精确度)mm.三、测定金属的电阻率1.实验目的(1)练习使用螺旋测微器(2)学会用伏安法测量电阻的阻值(3)测定金属的电阻率2实验原理欧姆定律和电阻定律由R LS得要测 ，需要测R、L、S.用毫米刻度尺测出金属丝的长度L；用螺旋测微器测出金属丝的直径d，得到横截面积Sd24；用伏安法测出金属丝的电阻R，由 RLS，得 RSLd2R4L.3.实验器材米尺(最小分度值1mm)、螺旋测

12、微器、直流电压表和直流电流表、滑动变阻器、电池、开关及连接导线、金属电阻丝.4.实验步骤(1)用螺旋测微器在被测金属导线上三个不同位置各测一次直径，求出其平均值d，计算出导线的横截面积S.(2)用毫米刻度尺测量接入电路中的被测量金属导线的有效长度，反复测量3 次，求出其平均值l.(4)电路经检查无误后，闭合开关S，改变滑动变阻器滑动片的位置，读出几组相应的电流表、电压表的示数I和U的值，记入记录表格内，断开开关S，求出电阻R的平均值.(5)将测得的R、l、d的值代入电阻率计算公式 RSLd2R4L.中，计算出金属导线的电阻率5.注意事项(1)本实验中被测金属导线的电阻值较小，因此实验电路必须采

13、用电流表外接法.(2)实验连线时，应先从电源的正极出发，依次将电源、开关、电流表、待测金属导线、滑动变阻器连成主干线路(闭合电路)，然后再把电压表并联在待测金属导线的两端.(3)金属导线的长度，应该是在连入电路之后再测量，测量的是接入电路部分的长度，并且要在拉直之后再测量.(4)接通电源的时间不能过长，通过电阻丝的电流不能过大，否则金属丝将因发热而温度升高，这样会导致电阻率变大，造成较大误差.(5)要恰当选择电流表、电压表的量程，调节滑动变阻器的阻值时，应注意同时观察两表的读数，尽量使两表的指针偏转较大，以减小读数误差文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1

14、A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档

15、编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7

16、N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1

17、A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1

18、J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B

19、10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 Z

20、C7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7精品文档收集于网络，如有侵权请联系管理员删除1.在“测定金属的电阻率”的实验中，用螺旋测微器测量金属丝直径时的刻度位置如图所示，用米尺测出金属丝的长度L，金属丝的电阻大约为5，先用伏安法测出金属丝的电阻Rx，然后根据电阻定律计算出该金属材料的电

21、阻率(1)从图中读出金属丝的直径为_ mm.(2)为此取来两节新的干电池、开关和若干导线及下列器材：A 电压表0 3 V，内阻 10 k B 电压表0 15 V，内阻 50 k C 电流表0 0.6 A，内阻 0.05 D 电流表0 3 A，内阻 0.01 E 滑动变阻器，010 F 滑动变阻器，0100 要求较准确地测出其阻值，电压表应选_，电流表应选_，滑动变阻器应选_ (填序号)实验中实物接线如图749 所示，请指出该同学实物接线中的两处明显错误1_ 2_ 文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L

22、3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4

23、 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1

24、H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7

25、文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:C

26、N7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6

27、W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 H

28、T1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7精品文档收集于网络，如有侵权请联系管理员删除2一位电工师傅为测量某电线厂生产的铜芯电线的电阻率，他截取了一段长为L的电线，并测得其直径为D，用多用电表测其电阻发现阻值小于1.为提高测量的精度，他从图 7 410 器材中挑选了一些元件，设计了一个电路，重新测量这段导线(下图中用Rx表示)的电阻 A 电

29、源E：电动势为3.0 V，内阻不计 B 电压表V1：量程为03.0 V，内阻约为2 k C 电压表V2：量程为015.0 V，内阻约为6 k D 电流表A1：量程为00.6 A，内阻约为1 E 电流表A2：量程为03.0 A，内阻约为0.1 F 滑动变阻器R1：最大阻值5，额定电流2.0 A G滑动变阻器R2：最大阻值1 k，额定电流1.0 A H 开关 S一个，导线若干(1)实验时电压表选_；电流表选 _；滑动变阻器选 _(填元件符号)(2)请设计合理的测量电路，把电路图画在作图框中，在图中表明元件符号(3)在实物图中用笔画线替代导线连接元件(4)某次测量时，电压表示数为U，电流表示数为I，

30、则该铜芯电线材料的电阻率的表达式为_.3将右图所示的螺旋测微器的读数写出来甲 _mm乙 _cm 3(2008 全国卷)某同学用螺旋测微器测量一铜丝的直径，测微器的示数如图实所示，该铜丝的直径为_mm.解析：螺旋测微器固定刻度部分读数为4.5 mm，可动刻度部分读数为0.093 mm，所以所测铜丝直径为4.593 mm.4(1)用游标为50 分度的游标卡尺测量某工件的长度时，示数如下图所示，则测量结果应该读作 _mm.(2)用螺旋测微器测圆柱体的直径时，示数如下体所示，此示数为_mm.5在“测定金属的电阻率”的实验中，待测金属丝的电阻Rx约为 5 ，实验室备有下列实验器材：A电压表 V1(量程

31、03 V，内阻约为15 k)B电压表 V2(量程 015 V，内阻约为75 k)C电流表 A1(量程 03 A，内阻约为0.2)D电流表 A2(量程 00.6 A，内阻约为1)E变阻器R1(0 100 ，0.6 A)F变阻器R2(02000 ，0.1 A)文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码

32、:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4

33、A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5

34、 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J1

35、0L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10

36、B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7

37、T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8

38、C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7精品文档收集于网络，如有侵权请联系管理员删除G电池组 E(电动势为 3 V，内阻约为0.3 )H开关S，导线若干(1)为减小实验误差，应选用的实验器材有_(填代号)(2)为减小实验误差，应选用图中_ 填(a)或(b)为该实验的电路原理图，并按所选择的电路原理图把实物图用线连接起来(3)若用毫米刻度尺测得金属丝长度为60.00 cm，用螺旋测微器测得金属丝的直径及两电表的示数如图所示，则金属丝的直径为_mm，电阻值为 _.实验描绘小灯泡的伏安特性曲线1在用电压表和电流表研究小灯泡在不同电压下的功率的实验中，实

39、验室备有下列器材供选择：A 待测小灯泡“3.0 V、1.5 W”B 电流表(量程 3 A，内阻约为1)C 电流表(量程 0.6 A，内阻约为5)D 电压表(量程 3.0 V，内阻约为10 k)E电压表(量程 15.0 V，内阻约为50 k)F 滑动变阻器(最大阻值为100，额定电流50 mA)G滑动变阻器(最大阻值为10，额定电流1.0 A)H 电源(电动势为4.0 V，内阻不计)I 电键及导线等(1)为了使实验完成的更好，电流表应选用_；电压表应选用_；滑动变阻器应选用 _(只需填器材前面的字母即可)(2)请在虚线框内画出实验电路图(3)某同学在一次测量时，电流表、电压表的示数如图755 所

40、示则电压值为 _ V，电流值为 _ A，小灯泡的实际功率为 _ W.解析：待测小灯泡“3.0 V、1.5 W”，额定电流0.5 A，额定电压为3 V，因此电流表选文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N

41、4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A

42、5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J

43、10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B1

44、0B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC

45、7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A

46、8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7精品文

47、档收集于网络，如有侵权请联系管理员删除 C，电压表选D，滑动变阻器采用分压式接法 较准确，滑动变阻器选G，小灯泡电阻很小，电流表外接答案：(1)C D G(2)如解析图所示(3)1.80 0.33 0.59 2在“描绘小灯泡的伏安特性曲线”的实验中，可供选择的实验仪器如下：小灯泡 L，“3.8 V、0.3 A”电压表 V，量程 05 V，内阻 5 k 电流表 A1，量程 0 100 mA，内阻 4 电流表 A2，量程 0500 mA，内阻 0.4 滑动变阻器R1，最大阻值10，额定电流1.0 A 滑动变阻器R2，最大阻值5，额定电流0.5 A 直流电源E，电动势约为6 V，内阻约为0.5 (1

48、)在上述器材中，滑动变阻器应选 ;电流表应选 .(2)在虚线框内画出实验的电路图，并在图中注明各元件的符号。(3)某实验小组完成实验后利用实验中得到的实验数据在IU坐标系中，描绘出如图所示的小灯泡的伏安特性曲线根据此图给出的信息，可以判断下图中正确的是(图中P为小灯泡的功率)()实验测定电池的电动势和内阻一、实验目的测定电源的 _。二、实验原理1、图 2.6-1中，电源电动势 E、内电阻 r，与路端电压 U、电流 I 的关系可写为 E=U+I r2、图 2.6-2中，电源电动势 E、内电阻 r、电流 I、电阻 R 的关系可写为 E=I R+I r文档编码:CN7N4A6W1A5 HT1J10L

49、3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4

50、 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1H1A8C7文档编码:CN7N4A6W1A5 HT1J10L3B10B4 ZC7T1