Tuesday, April 19, 2011

Physics Form 5: Chapter 2 - Electric Bell (Application of Electromagnet)

  • When the switch is pressed, a current flows through the solenoids and the electromagnets attract a soft-iron plate.
  • The striker hits the gong and a sound is produced.
  • The movement of the soft-iron plate breaks the contact and the circuit is cut off.
  • The electromagnet loses its magnetism and the striker springs back to original position.
Click on the diagram below to play!

1 comment:

Jie Ren Sit said...

May i know what will happen if the spring is replaced by a piece of wire?