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5K10.25 Flashlight Charged by Induction coil A flashlight is available that uses a capacitor charged up by moving a magnet back and forth through a coil instead of batteries. Output of coil is fed to capacitor through a full wave rectifier so charges up with magnet going right to left and vice versa.
Picture: Not Yet Available Setup Requirements: Off the shelf. You will have to move the magnet back and forth a number of times to get the leds to light up.
Equations: Faraday's Law: An EMF is induced that is proportional to time rate of change of magnetic flux. Safety Issues: None |