Sunday, July 1, 2012

Physics Form 5: Chapter 3 - Application of Electromagnetic Induction (Torchlight)

Electromagnetic induction is the production of induced current by changing magnetic field. By using kinetic energy of shaking hand, electrical energy is produced to power the flash light through electromagnetic induction.

Kinetic energy ------> Electrical energy

  • A powerful permanent magnet such as neodymium magnet is used because of small size with strong magnetic field. The permanent magnet is placed inside a plastic track which allow it to slide up and down.
  • The shaking hands move the strong magnet to cut through the copper coils causing electromagnetic induction. 
  • The electrical energy produced is stored in a capacitor that can be charged hundreds of thousands times.
  • The bulb is an energy efficient ultra bright white LED that can produce a beam of light for several minutes after shaking the moving magnet for 30 seconds.

For more information, click below video

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