Video: Watch this demo
Description: This is a “Faraday’s Flashlight” as seen on TV.
A magnet moves up and down inside a coil of wire. Current is induced and forced into a capacitor (direction of the moving magnet does not matter).
The LED runs off the capacitor.
- Faraday Flashlight
- Shake the flashlight up and down fast for about a minute. Then turn it on.
Note: Not a very effective flashlight, but still a cool concept (and involves many elementary E&M principles).