初中物理“研究电磁铁”一课是一堂实验课.过去我教这一课时,只是通过课堂演示得出电磁铁磁性强与电流大小、螺线管匝数有关的结论,然后给学生介绍一些电磁铁在生产和生活中的应用,再通过习题加以巩固,这样扼杀了学生的主动性和创造性,没有起到好的教学效 The junior high school physics“research electromagnet” lesson is an experimental class. In the past, when I taught this lesson, I used the classroom demonstration to draw the conclusion that electromagnet magnetism is related to the size of the current and the number of turns in the solenoid, and then introduce the students. The application of some electromagnets in production and life is consolidated through exercises, thus killing students’ initiative and creativity and not playing a good teaching effect.