根据学生的心理特点和认知规律,利用物理实验,将“短路”难点逐步分解,渗透于初三电学教学的各个阶段,可使学生学得轻松,理解得透彻. According to the students’ psychological characteristics and cognitive rules, using physical experiments, the “short-circuit” difficulties are gradually broken down and infiltrated into all stages of the third grade of electrical teaching, which can make students learn easily and thoroughly.