摘要
伏安法测量电阻的系统误差主要是由电流表的内阻/电压表的内阻引起的。设计用内接法和外接法测量大、中、小三个电阻的开放内容。结果表明,对于给定大和小的电阻,分别使用内接法、外接法测量时不确定度较小;而内、外接法测量中阻值的不确定度较大,说明伏安法测量特定阻值的电阻仍存在方法上的不足。引入的补偿法、电桥法等方法可以准确测量电阻,弥补了伏安法的不足。补偿法、电桥法等提供了电阻精确测量问题的任务驱动,有利于实验室的开放和学生自主学习。
The systematic error of measuring resistance by voltammetry is mainly caused by the internal resistance of ammeter and voltmeter.It is designed to measure the open contents of large,medium and small resistors by internal connection and external connection.The results show that for the given large and small resistors,the uncertainty of the results measured by the internal connection method and the external connection method is small.The uncertainty of measurement is large for medium resistor in the measurement of internal and external connection,which indicates that there are still methods of defect in voltammetry.The compensation method and electric bridge method introduced can accurately measure resistance and make up for the deficiency of voltammetry.The compensation method,the electric bridge method and so on provide the task driving for the precise measurement of resistance,which is conducive to the opening of laboratories and students＇ autonomous learning.
作者
敬晓丹
李久会
王文新
邱忠媛
张云竹
袁泉
李义
JING Xiao-dan;LI Jiu-hui;WANG Wen-xin;QIU Zhong-yuan;ZHANG Yun-zhu;YUAN Quan;LI Yi(Liaoning University of Technology,Liaoning Jinzhou 121001)
出处
《大学物理实验》
2018年第4期124-126,共3页
Physical Experiment of College
基金
辽宁省教育厅教学改革研究项目(UPRP20160289)
关键词
自主学习
伏安法
补偿法
电桥法
autonomous learning
voltammetry
teaching reform
compensation method
electric bridge method
