一、案例背景波利亚说:“学习任何知识的最佳途径是通过自己的实践活动去发现,因为这样的发现理解最深,也最容易掌握内在规律、性质和联系.”课堂教学的有效性首先取决于学生对知识形成过程的体验,体验学习遵循学生认知规律从具体到抽象、从感性到理性的过程.电动机是初中科学必学内容,学生在生活中经常接触电动机,对电动机并不陌生,但他们拥有的“电和磁”知识并不多,学前知识是模糊的、 Case Background Polia said: “The best way to learn any knowledge is to discover it through its own practical activities because it is the deepest understanding and the easiest to grasp the laws, nature and connections.” Effectiveness first depends on the students experience of knowledge formation process, experience learning to follow the cognitive rules of students from concrete to abstract, from sensibility to rational process.Motor is junior high school science must learn content, students in life often touch the motor, the motor Are not strangers, but they do not have much “electric and magnetic” knowledge, and preschool knowledge is vague,