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现行中等专业学校物理教科书在电源电动势这一节中,是利用导体在磁场中运动的图来说明电源电动势的概念、电源内部电荷受力的情况以及电源电动势与电势降落的关系.这样进行教学一方面不能演示实验,另一方面初中同学对感生电势还很生疏,调干同学有的还没有学过.同学们感到电源电动势很抽象难于接受.为了解决这一问题,我是这样进行教学的:先将电池提到电源电动势的前面讲,再从电池把化学能转换成电能的角度通过实验讲述电源电动势.在这课中只讲电源电动势的概念和决定电池电动势的条件及它与电势差的区别.
The current physics textbook for secondary specialized schools in the section on power electromotive force describes the concept of power electromotive force, the situation of the internal charge of the power source, and the relationship between the power electromotive force and the potential drop. This is taught in the diagram of the power electromotive force. On the other hand, junior high school students are still unfamiliar with the induced electric potential, and some of the students have not learned how to adjust. The students feel that the power EMF is very abstract and difficult to accept. In order to solve this problem, I did this teaching. : The first mention of the battery before the power EMF, and then from the perspective of the battery to convert chemical energy into electrical energy through the experiment to tell the power EMF. In this lesson only talk about the concept of the power EMF and determine the conditions of the battery EMF and its difference with the potential the difference.