| The educator Dewey proposed that education is the continuous transformation of experience.Access to relevant information,students enter the classroom with their perceptual knowledge in life,and relevant scholars call this part of the understanding the former concept.The wrong pre-concept may hinder students’ learning.Domestic and foreign scholars have focused on the formation of the former concept and the transformation strategy.The study of electromagnetism is a difficult point in high school physics.There are few related studies,and the practical research on concept transformation is less involved.Based on the existing research,this paper combines the three teachings of long-distance transmission,magnetic induction and Lenz’s law as the research scope,based on the CSEM(Concept Survey of Electricity and Magnetism)questionnaire,combined with subject professors and first-line teachers.The results of the interview conducted a pre-concept survey of students in different levels of a high school inTian Jin City,clarifying the nine pre-concepts of the student’s existence of "the conductor is not affected by the magnetic field,and the field strength is zero".Design a targeted experimental teaching program,implement demonstration experiment teaching in the experimental class,and implement regular teaching in the control class.After the completion of the teaching,the post-test is carried out,and it is concluded that among the students with the same level of achievement,the demonstration experiment teaching is better than the conventional teaching.For students with different levels of achievement,demonstrating experimental teaching is more effective in transforming the concept of students with lower levels.It is proposed that in the teaching process,the pre-concept of the students should be clarified,the corresponding demonstration experiments should be designed,and the suggestions of the pre-concepts should be changed. |
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