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1、第 2 讲电学实验与创新1.(2017 甘肃庆阳模拟)某同学要探究一种新材料制成的圆柱体的电阻.步骤如下:(1)用游标为 20 分度的卡尺测量其长度如图1,由图可知其长度为 mm.(2)用 螺 旋 测 微 器 测 量 其 直 径 如 图2,由 图 可 知 其 直 径 为 cm.(3)用多用电表的电阻“10”挡,按正确的操作步骤测此圆柱体的电阻,表盘的示数如图 3,则该电阻的阻值约为.(4)该同学想用伏安法更精确地测量其电阻R,现有的器材及其代号和规格如下:待测圆柱体电阻 R;电流表 A1(量程 04 mA,内阻约 50);电流表 A2(量程 010 mA,内阻约 30);电压表 V1(量程 0
2、3 V,内阻约 10 k);电压表 V2(量程 015 V,内阻约 25 k);直流电源 E(电动势 4 V,内阻不计);滑动变阻器 R1(阻值范围 015,允许通过的最大电流2.0 A);滑动变阻器 R2(阻值范围 020 k,允许通过的最大电流0.5 A)开关 S;导线若干;为使实验误差较小,要求测得多组数据进行分析,请在图 4 方框中画出测量的电路图,并标明所用器材的代号.解析:(1)游标卡尺的读数为L=50 mm+3 0.05 mm=50.15 mm;(2)螺旋测微器的读数为d=4.5 mm+20.00.01 mm=4.700 mm=0.470 0 cm;(3)欧姆表的读数为 R=22
3、 10=220;(4)由于电压表 V2量程太大(量程的 大于电源的电动势),所以电压表应选择 V1;根据欧姆定律可求出通过待测电阻的最大电流为Imax=A14 mA,所以电流表应选择A2;根据实验要求多测几组数据可知变阻器应采用分压式接法,应选择阻值小的变阻器以方便调节;由于待测电阻满足,电流表应用外接法,画出电路图,如图所示.文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10
4、H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2
5、M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1
6、J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J1
7、0V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB
8、1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H
9、2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编
10、码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8答案:(1)50.15(2)0.470 0(3)220(4)见解析图2.(2017 江西上饶一模)一个小灯泡的额定电压为2.0 V,额定电流约为 0.5 A,选用下列实验器材进行实验,并利用实验数据描绘和研究小灯泡的伏安特性曲线A.电源 E:电动势为 3.0 V,内阻不计B.电压表 V1:量程为 03 V,内阻约为 1 k C.电压表 V2:量程为 015 V,内阻约为 4 k D.电流表 A1:量程为 03 A,内阻约为 0.1 E
11、.电流表 A2:量程为 00.6 A,内阻约为 0.6 F.滑动变阻器 R1:最大阻值为 10,额定电流为 1.0 A G.滑动变阻器 R2:最大阻值为 150,额定电流为 1.0 A H.开关 S,导线若干(1)实验中使用的电压表应选用;电流表应选用;滑动变阻器应选用(请填写选项前对应的字母).文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1
12、J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7
13、ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y
14、7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文
15、档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK
16、10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2
17、N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 H
18、A1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8(2)实验中某同学连接实验电路如图1 所示,请你不要改动已连接的导线,在图 1 的实物连接图中把还需要连接的导线补上.闭合开关前,应使变阻器滑片放在最(填“左”或“右”)端.(3)实验中得到的其中一组电压表与电流表示数如图2 所示,请将该组数据标记在 U-I 坐标中,其余实验数据已标记在图3的坐标中,请你画出小灯泡的 U-I 图线.并简述该图线不是直线的主要原因 .(4)若将实验中的小灯泡接在电动势是1.5 V、内阻是 1.0 的电池两端,则小灯泡的实际功率约为 W
19、(保留两位有效数字).解析:(1)灯泡额定电压为2 V,电压表应选 B,灯泡额定电流为0.5 A,电流表应选 E,为方便实验操作,滑动变阻器应选F.(2)描绘灯泡伏安特性曲线,电压与电流应从零开始变化,滑动变阻器应采用分压接法,灯泡正常发光时电阻约为R=4,电压表内阻约为1 k,电压表内阻远大于灯泡电阻,电流表应采用外接法,实验电路图如图(甲)所示;为保护电路,闭合开关前,滑片应置于左端.文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA
20、1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J
21、10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 Z
22、B1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7
23、H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档
24、编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK1
25、0H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N
26、2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8(3)根据坐标系中描出的点,用平滑的曲线把各点连接起来,作出灯泡的 U-I 图像,如图(乙)所示.由于灯泡电阻受温度影响,灯泡电阻随温度升高而增大,所以灯泡的U-I 图线不是直线.(4)在灯泡的 U-I 图像坐标系中作出电池的U-I 图像,如图(丙)所示;由图像可知,用该电池给灯泡供电时,灯泡两端电压为1.1 V,电流为0.4 A,则灯泡实际功率P=UI=1.10.4 W=
27、0.44 W.答案:(1)B E F(2)见解析图左(3)见解析图灯丝电阻随温度升高而增大文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编
28、码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10
29、H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2
30、M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1
31、J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J1
32、0V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB
33、1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8(4)0.44 3.(2017 宁夏石嘴山二模)用下列器材组装成一个电路,既能
34、测量出电池组的电动势 E和内阻 r,又能同时描绘小灯泡的伏安特性曲线.A.电压表 V1(量程 6 V,内阻很大)B.电压表 V2(量程 3 V,内阻很大)C.电流表 A(量程 3 A,内阻很小)D.滑动变阻器 R(最大阻值 10,额定电流 4 A)E.小灯泡(2 A,5 W)F.电池组(电动势 E,内阻 r)G.开关一只,导线若干实验时,调节滑动变阻器的阻值,多次测量后发现:若电压表 V1的示数增大,则电压表 V2的示数减小.(1)请将设计的实验电路图在图(甲)的虚线方框中补充完整.(2)每一次操作后,同时记录电流表A、电压表 V1和电压表 V2的示数,组成两个坐标点(I1,U1),(I2,U
35、2),标到 UI 坐标中,经过多次测量,最后描绘出两条图线,如图(乙)所示,则电池组的电动势E=V、内阻r=.(结果保留两位有效数字)(3)在 U-I 坐标中两条图线在 P点相交,此时滑动变阻器连入电路的阻值应为.文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1
36、J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7
37、ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y
38、7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文
39、档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK
40、10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2
41、N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 H
42、A1J3Q1J10V7 ZB1N8Y7H2G8解析:(1)伏安法测电源电动势与内阻实验中,电压表测路端电压,电压表示数随滑动变阻器接入电路阻值的增大而增大;描绘小灯泡伏安特性曲线实验中,电流表测流过灯泡的电流,灯泡两端电压随滑动变阻器接入电路电阻的增大而减小;调节滑动变阻器时,电压表 V1的示数增大,则电压表 V2的示数减小,则 V1测路端电压,V2测灯泡两端电压,电路图如图所示.(2)电源的U-I图像是一条倾斜的直线,由图像可知,电源电动势E=4.5 V,电源内阻r=1.0.(3)由图像中 P点的坐标可知,灯泡电压 UL=2.5 V,此时电路电流 I=2.0 A,电源电动势 E=Ir+UL+
43、IR滑,即 4.5 V=2.0 A 1+2.5 V+2.0 A R滑,则 R滑=0.答案:(1)见解析图(2)4.5 1.0(3)0 4.(2017 湖北黄冈模拟)热敏电阻包括正温度系数电阻器(PTC)和负温度系数电阻器(NTC),正温度系数电阻器的电阻随温度的升高而增大,负温度系数电阻器的电阻随温度的升高而减小.某实验小组选用下列器材探究某一热敏电阻Rx的导电特性,文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7
44、ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y
45、7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文
46、档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK
47、10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2
48、N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 H
49、A1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1
50、J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8文档编码:CK10H3H2N2M2 HA1J3Q1J10V7 ZB1N8Y7H2G8A.电流表 A1(满偏电流 10 mA,内阻 r1=10)B.电流表 A2(量程 0.6 A,内阻 r2为 0.5)C.滑动变阻器 R1(最大阻值 10)D.滑动变阻器 R2(最大阻值 500)E.定值电阻 R3(阻值 1 490)F.定值电阻 R4(阻值 140)G.电源 E(电动势 15 V,内阻忽略)H.开关与导线若干(1)实验采用的电路图如图1 所示,则滑动变阻器选,定值电阻R选.(填仪