Research On Understanding Of DC Circuit Concept Based On Regular Space Model

DC circuit is the basic concept of electromagnetics.Whether or not the related concepts of DC circuit can be understood deeply and master the knowledge of electromagnetics has a profound influence on students.However,through communication with front-line teachers,it is found that many students only stay on the surface in mastering the contents of DC circuits,understand the knowledge points as if they do not understand them,and know the specific contents of DC circuits.But it can not be applied to the reality of life.In this case,how to accurately judge the degree of students' mastery of the concept of DC circuit?At present,the evaluation of students'conceptual understanding has been transitioning from classical measurement theory to diagnostic evaluation,and some achievements have been made.The students'cognitive level in specific aspects can be diagnosed by the students'answers to the diagnostic measurement questions.Due to the different research angles and research emphasis,most of the test scales compiled according to the theory of diagnosis and measurement are "one-time test questions",which lack a certain degree of extensibility.Since the development of The Determining and Interpreting Resistive Electric Circuit Concepts Test,the number of test samples has been more than 2000,involving middle school students and college students from many countries,such as the United States,Germany,Canada and other countries.It can accurately diagnose the significant problems existing in the concept of DC circuit.In this paper,The Determining and Interpreting Resistive Electric Circuit Concepts Test scale was used to test 348 senior high school students(391 students and 348th effective students)in four different types of schools in Baoji City,Shaanxi Province.The regular space model of cognitive diagnosis theory is used to diagnose and analyze the answers of the 348th students,and according to the results of the analysis,the students are provided with a diagnostic report on the understanding of the concept of DC circuit.It provides a scientific reference for teachers to carry out class rescue teaching.In this paper,seven conceptual attributes and their hierarchical relationships needed to answer The Determining and Interpreting Resistive Electric Circuit Concepts Test scale are finally determined by means of questionnaire survey and expert audit.A total of 37 ideal response modes generated by these seven attributes and their hierarchical relationships are calculated by using the regular space model,and the differentiation parameters and difficulty parameters of The Determining and Interpreting Resistive Electric Circuit Concepts Test scale are estimated by using SPSS20.0 software.Then,the selected samples are tested and the data are analyzed.With the help of Winsteps software,the ability value ?xi and the ideal reaction mode capability value ?Rj;are calculated.The test results are analyzed and calculated by using the two-parameter logical Steark model and Excel software.The personal fitting index Cx;and the ideal response mode fitting index ?Rj,reflecting the abnormal answer of the students are obtained.Create a regular space composed of ability 0 and warning index ?,Finally,with the help of Matlab software,310 students were successfully enrolled into 36 ideal response models by using the minimum Markov distance discriminant method(because of the limitations of the project response theory in estimating the parameters,the original 37 ideal response models).36 ideal reaction models can be analyzed).The proportion of successful classification is 89.08%,which is compared with the 90%successful classification standard,which shows that the determination process of attributes and their hierarchical relationships in this study is scientific and reasonable.The application of two-parameter estimation method is more successful.Finally,according to the results of the analysis,the DC circuit outline is provided for the individual students.The diagnostic report of reading understanding provides a scientific reference for teachers to carry out class rescue teaching.