Development of Teaching Tool for Learning Eddy Current with Electromagnetic Induction through Measurement Experimentally and Lesson Practice

Abstract

Various products which used a magnet have been developed, and it is necessary to learn about its practical use in Industry Arts Course at Junior High School. Then, three kinds of teaching tool for learning the mechanism of an eddy current experinentally were developed as an example of practical use of magnet. Developed teaching tools as follows ; (1) it is a slide teaching tool that a magnet slip down on the slope made of various metals, (2) it is a coin falling teaching tool that various coins slip down on the slope in which two magnets are set in parellel on the way, (3) it is a torque measurement teaching tool that the rotating speed of aluminum disk is deduced by applying the magnetic field, and its torque is measured. As these results, the work of an eddy current could be learned in experience and the concern about magnet or science of students was able to be raised.