在初中物理的学习中往往贯穿一些抽象深奥的物理概念、规律或现象,如电流、磁场、内能等。初中阶段学生由于刚刚接触物理,再加上心理和思维的特殊性,学习这方面的知识往往存在较大困惑。为使他们比较容易接受,教材通常应用转换法来达到教学目的。 In junior high school physical learning often runs through some abstruse physical concepts, laws or phenomena, such as current, magnetic field, internal energy and so on. Junior high school students just because of physical contact, coupled with the special nature of the mentality and thinking, learning this knowledge is often a big confusion. In order to make them more acceptable, textbooks usually use the conversion method to achieve the teaching purpose.