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目前,中学物理实验教学中常用的直流电源。如干电池、蓄电池、低压电源等,内电阻都很小。因而不能用来验证闭合电路欧姆定律,不能测定它的短路电流,也不能用来研究电池组的总内电阻与各单个电池内电阻之间的关系。在《研究电源的输出功率》的实验中,必须给它串接一只假内阻,才能使用。为了解决这些问题,我们设计制造了电动势稳定,具有一定容量,内电阻比较大而且可以调节的“可调内阻电池”。下面对该电池及其设计作些介绍。
At present, the middle school physics experiment teaching commonly used DC power supply. Such as batteries, batteries, low-voltage power supply, the resistance is small. So it can not be used to verify the closed circuit Ohm’s law, can not determine its short circuit current, can not be used to study the total internal resistance of the battery and the relationship between the resistance of each single battery. In the “study of the output power of power” experiment, it must be given a series of false internal resistance, to use. In order to solve these problems, we design and manufacture a stable electromotive force, with a certain capacity, relatively large internal resistance and can be adjusted “adjustable internal resistance battery.” The following describes the battery and its design.