用板式电势差计测量电池电动势及内阻实验的新方法

A new experimental method with potentiometer measuring electromotive force and internal resistance of battery

增大板式电势差计电阻丝的有效长度,可以直接测量电池的电动势,再根据全电路欧姆定律求得内阻.这种用板式电势差计测量电池电动势及内阻实验的方法,可以简化实验步骤,提高实验精确度.

By increasing the active length of resistance wire in plate-type potentiometer, we can directly measure the electromotive force （ EFM ） of battery, then work out the internal resistance according to the whole circuit Ohm＇s law. Such experiment method, measuring the EMF＇s internal resistance by plate-type potentiometer, can simplify the experimental procedure, and improve the accuracy.