| 摘要 |
PURPOSE: An electromagnetic induction principle learning apparatus is provided to improve ingenuity by arousing student's interest. CONSTITUTION: A plurality of coils(3,8) is wound around at the exterior of a transparent acrylic tube of a solenoid in a clockwise direction and coils(2,7) are wound around the plurality of coils in a counter clock-wise direction. An LED(6) is connected to both ends of the plurality of coils which are wound in the clockwise direction. An LED(4) is connected to both ends of the coils which wound in the counter clock-wise direction. A lid(1) of rubber material covers the external diameter of the transparent acrylic tube. A permanent magnet(5) changes a magnetic field in around the coils and turns on the electricity when shaking the solenoid upwards and downwards. |
