In simple electrical conductors, the current I which passes through the conductor is proportional to the applied voltage U. The constant of proportionality, the ohmic resistance R, is dependent on the length x of the conductor, its cross-sectional area A and the nature of the material. This relationship is to be investigated using constantan and brass wires.
![实验: 欧姆定律, 8000613 [UE3020320-230], Charge transport and current](/imagelibrary/UE3020320-230/UE3020320-230_01_实验-欧姆定律.jpg)
![实验: 欧姆定律, 8000613 [UE3020320-230], Charge transport and current](/thumblibrary/UE3020320-230/UE3020320-230_01_1200_1200_实验-欧姆定律.jpg)
![直流电源,
0 – 20 V, 0 – 5 A
, 1003312 [U33020-230], 供电器](/thumblibrary/U33020-230/U33020-230_01_140_140_直流电源-0-20-V-0-5-A.jpg)
![精确的测力计（透明）, 1003106 [U20034], 弹簧秤和弹簧](/thumblibrary/U20034/U20034_01_140_140_精确的测力计-透明.jpg)
![带有挂钩的固定夹, 1002828 [U13252], 夹具](/thumblibrary/U13252/U13252_01_140_140_带有挂钩的固定夹.jpg)
![15根安全实验导线套件，75mm, 1002843 [U138021], 弗兰克-赫兹 – 配件](/thumblibrary/U138021/U138021_01_140_140_15根安全实验导线套件-75mm.jpg)
![模拟万用表ESCOLA 30, 1013526 [U8557330], 手持模拟测量仪器](/thumblibrary/U8557330/U8557330_01_140_140_模拟万用表ESCOLA-30.jpg)
![双联式三脚架座, 1002835 [U13270], 基底](/thumblibrary/U13270/U13270_01_140_140_双联式三脚架座.jpg)
![Resistance Apparatus, 1009949 [U8492030], 电循环](/thumblibrary/U8492030/U8492030_01_140_140_Resistance-Apparatus.jpg)
![成对安全实验导线，75cm, 2,5 mm², 1017718 [U13816], 实验用导线和电缆](/thumblibrary/U13816/U13816_01_140_140_成对安全实验导线-75cm-2-5-mm.jpg)
![游标卡尺，150 mm, 1002601 [U10071], 长度测量](/thumblibrary/U10071/U10071_01_140_140_游标卡尺-150-mm.jpg)
![数字化秒表, 1002811 [U11902], 长度测量](/thumblibrary/U11902/U11902_01_140_140_数字化秒表.jpg)
![通用夹, 1002830 [U13255], 夹具](/thumblibrary/U13255/U13255_01_140_140_通用夹.jpg)
![圆筒支脚, 1002834 [U13265], 基底](/thumblibrary/U13265/U13265_01_140_140_圆筒支脚.jpg)
![可倾斜的平面, 1003213 [U30015], 线性运动](/thumblibrary/U30015/U30015_01_140_140_可倾斜的平面.jpg)
![演示力的工作台, 1000694 [U52004], 静力学](/thumblibrary/U52004/U52004_01_140_140_演示力的工作台.jpg)
![光控计时门, 1000563 [U11365], 传感器](/thumblibrary/U11365/U11365_01_140_140_光控计时门.jpg)
![不锈钢杆 750mm, 1002935 [U15003], 三脚架杆 支架杆](/thumblibrary/U15003/U15003_01_140_140_不锈钢杆-750mm.jpg)
![不锈钢杆 1000mm, 1002936 [U15004], 杆](/thumblibrary/U15004/U15004_01_140_140_不锈钢杆-1000mm.jpg)
![带加热线圈的热量计，150ml, 1000822 [U8441020], 热量计](/thumblibrary/U8441020/U8441020_01_140_140_带加热线圈的热量计-150ml.jpg)