Learning Progression Study On The Important Concepts Of Electromagnetic Field In High School Physics

In recent years,education researchers all over the world pay more and more attention to the study of advanced learning,especially in the field of science education.In the teaching of physical subject,it is found that students' understanding of scientific concept can't be deepened with the increase of grade,and the understanding of knowledge is split and cannot form a complete concept system.Such education is inefficient.For this reason,in 2017,based on the improvement of students' subject core literacy,the physics curriculum structure of senior high school was redesigned,the physics content of senior high school was coordinated,and the formation and development of physics concept was emphasized.This tells us that we must pay attention to the stage of subject knowledge in teaching.Electromagnetic field is the core content of physical electromagnetics,which plays an important role in students' overall understanding of physical subject system.Therefore,it is very important to build an advanced learning model of the important concepts of electromagnetic field.Through the model,we can understand the ability level of students and the next advanced direction of students,so as to better help students complete the construction of knowledge system.This research focuses on the research topic of "electromagnetic field",from the following aspects:First,the important concept of "electromagnetic field" is screened.By combing the physics textbooks of senior high school,analyzing the requirements of the physics curriculum standards of senior high school in China,and referring to the next generation of science standards(NGSS)of the United States,the important concepts of electromagnetic field are preliminarily determined.Then,referring to the survey results of the first-line teachers and the analysis of the outline of the national physics college entrance examination in 2015-2019,the important concepts of electromagnetic field are selected;Second,the advanced hypothesis of learning the important concepts of electromagnetic field is constructed;Third,develop a survey questionnaire and investigate the students.Consult the relevant materials,develop the original question bank,and measure the level of students with the questionnaire reviewed by curriculum experts and front-line teachers.Then,Rasch model is used to analyze the measurement data,and the questionnaire is revised according to the analysis results;Fourth,to verify and explain the advanced learning.The revised questionnaire is used to retest the students.According to the results,the difficulty value of important concepts is obtained.As the basis of verifying and revising the advanced learning hypothesis,the advanced learning navigation map is divided into four stages.Then take the study of the two important concepts of electric potential energy and Lenz's law as an example to interview the students and explain the advanced mechanism of the important concepts.Fifth,carry out practical research.Based on the advanced learning model,the actual teaching is carried out to verify the effectiveness of teaching according to the advanced learning model,and it is suggested that teachers should pay attention to the important concept teaching,set the teaching objectives of different levels,plan the advanced learning path,and pay attention to the process evaluation.To sum up,this study combs out 30 important concepts of physical electromagnetic field in senior high school and obtains their difficulty values from the perspective of combination of theory and practice,and constructs an advanced learning navigation map of important concepts of electromagnetic field,which is roughly divided into four stages: The first stage is to explain the interaction between charges on the basis of Newtonian mechanics,and to construct an abstract concept of "field";The second stage is to transcend the over distance action of Newtonian mechanics,take "field" as the basic element to explain the force of charge,and construct the concept of interaction in the starting field;The third stage is to construct the viewpoint of "energy" in the concept of "field" from the relationship between electromagnetic motion and other forms of motion;The fourth stage is to grasp the result of the interaction between the electric field and the magnetic field as a whole,and to be able to explain the properties of the electromagnetic wave from the point of view of the materiality of the field and the energy of the field.At the same time,we also found that in the process of learning physical concepts,students are not only accompanied by the advancement of physical concepts,but also with the advancement of expression,scientific methods,model construction and other aspects: For examples,after learning the electric field,students have completed the advanced description of the effect of the force between charges from the view of Newtonian mechanics of motion to the view of field;After learning electric potential energy,we can use analogy method to explain the change of motion state in electrostatic field;The interaction between charged bodies can be explained by the idea of calculus and point charge model.On the basis of mastering the advanced situation of the whole stage,this paper studies the advanced learning mechanism of each class based on specific teaching tasks,and the teaching practice has achieved good results.This research has not only the theoretical explanation but also the exploration of teaching practice,so it can provide some reference for the teaching of physical electromagnetic field in senior high school.