5K40.80 Hand Crank Flashlight
Electromagnetic induction, conservation of energy, Faraday's law
The flywheel inside the flashlight spins when the handle is squeezed. Since the flywheel is mounted on a magnet, the rotation of the flywheel creates a change in magnetic flux. This generates an EMF that illuminates a light bulb inside the flashlight. Note: the apparatus is small but the light is visible from the back of a large lecture hall when the room lights are dimmed.
-  Hand crank flashlight (a flashlight containing a coil and a rotating magnet)
- Squeeze the handle repeatedly until light bulb is turned on.
- PIRA 5K40.80
- Don't attempt this at home!
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.