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利用发光二极管的单向导电性和导通时能发出美丽的红(绿、黄)光的独特优点,能成功地演示电磁感应现象。本实验电路与通常的电路相同,仅用两只发光二极管D_1、D_2代替了电流表,见图,实验可分以下几步完成。 1.将处在磁场中的a、b段导体作切割磁力线运动,使发光二极管D_1(或D_2)发光,据此可得出闭合电路的一部分导体在磁场里做切割磁力线的运动时导体
Utilizing the unidirectional conductivity of light emitting diodes and the unique advantages of emitting beautiful red (green, yellow) light when conducting, can successfully demonstrate electromagnetic induction. The experimental circuit is the same as the usual circuit. Only two light emitting diodes D_1 and D_2 are used instead of the ammeter. See the figure. The experiment can be divided into the following steps. 1. The conductors a and b in the magnetic field are used as cutting magnetic lines of force to make the light-emitting diode D_1 (or D_2) emit light. Accordingly, it can be concluded that a part of the conductors of the closed circuit are used to cut the magnetic lines of force in the magnetic field.