加藤, 徹也

KATO, Tetsuya

[SUMMARY] The electromagnetic induction phenomenon, in which an electromotive force is generated by changing the magnetic flux penetrating the coil, has familiar applications such as transportation IC cards and IH cookers. These are very attractive technologies for students, and if they can be demonstrated in the classroom, students will be interested in this content. In this research, we made a teaching resource with an oscillating circuit that displays the basic mechanism of wireless electricity transmission technology. In doing so, we stress the importance of using the simplest forms when using teaching materials for junior high school students. Hence, we adopted a "blocking oscillator circuit" consisting of one dry cell battery, a pair of coils, one resistor and one transistor. In this report, we will explain the procedure for creating the experimental equipment, a completed example, and the operating principle. Finally, we will report on the changes in the frequency and the collector voltage of the circuit when the resistance value and the number of coil turns are changed.