Simple Generator

We slowly rotated the disc connected to the magnet to make a half turn. We also observed the two red light- emitting diodes and the voltmeter. After that, we rotated the disc fast to make a sudden half turn of the magnet.
When we turned the magnet slowly, the change of magnetic field is slow and little current is induced. When we quickly turned the magnet, the magnetic field changed rapidly making the LEDs light brightly. When we continuously turned the magnet at a faster rate, greater current is induced. The interval between the alternating current became so short that the LEDs light up and blinked continuously. This exhibit demonstrates generation of electricity.