5K10.25 Inductive Coil with Lamp (Shake Flashlight, Forever Flashlight)
Concepts
Electromagnetic induction, conservation of energy
Overview
As the flashlight is shaken, a magnet passes through a coil of wire connected to an LED, which illuminates.
Details
Equipment
- [1] Flashlight containing a coil and strong magnet
Script
- Dim the lights.
- Hold the flashlight horizontally and shake it so the magnet moves through the coil. Shine the light at the audience.
Additional Resources
References
- PIRA 5K10.25
Disclaimer
- Don't attempt this at home!
Last revised
- 2023
Technicals
- Original construction: purchased. The flashlight has had its capacitor and on/off switch removed so that the magnet and coil directly connect to the flashlight bulb.
Related AV
Related demos
- Hand Crank Flashlight
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.