用板式电势差计测量电池的电动势和内阻实验的改进

Improvement on the experiment of measuring the emf and internal resistance of the dry cell with potentiometer

分析了在“用板式电势差计测量电池的电动势和内阻”实验中 ,由于待测干电池的电动势和内阻在实验过程中均不为恒定值而引起的误差 ,依据电化学理论和电阻构成解释了实验现象 ,并给出了实验改进方案 .

This paper pointed out the error caused by the change of emf and internal resistance of dry cell, which exist in the experiment of the measurement of the emf and internal resistance of the dry cell with potentiometer. The experimental phenomenon can be explained using the theory of electro-chemistry and the made-up of resistance. The improved experimental design is given.