大学物理综合性实验的创新尝试——金属电阻率的精确测量

设计出了大学物理综合性实验——测量金属的电阻率。该实验用直流双臂电桥测细铜丝的电阻,用光学中的等厚干涉原理测量细铜丝的微小直径,根据电阻定律计算铜的电阻率,是光学、电学的综合实验。测量结果与常用电工手册上铜电阻率值的相对误差小于1.1%。通过实验,能够加强学生对光学、电学以及基本测量知识的综合运用能力,巩固理论知识,提高实验技能。

THE INNOVATION OF SYNTHESIZED EXPERIMENT OF COLLEGE PHYSICS——THE EXACT MEASURE OF RESISTANCE RATIO OF METAL

In this paper,the synthesized experiment of college physics was designed,which name was The Exact Measure of Resistance Ratio of Metal.It was synthesized by using optics and electricity.In this experiment,the resistance was measured by electricity bridge of direct current double arms,the diameter of thin brass wires was measured by the theory of interference of optics,and the resistance ratio of metal was calculated by using resistance law As a result,the relative error of the resistance ratio was less than 1.1%.By this experiment,the ability of students about using optics and electricity and basic measure was strengthened.Further more,the theory was solidified and the experiment skill was advanced,too.