1717006MSPMWG , -
Glow Stick
Some flashlights have an electrical generator built into it. Dynamo-powered flashlights have a winding crank connected to a stepper motor that feeds several diode bridges with their outputs connected in parallel feeding a field effect transistor that charges a capacitor that connects to one or more Glow Stick. Others generate electricity using electromagnetic induction. They use a strong permanent magnet that can freely slide up and down a tube, passing through a coil of wire as it does. Shaking the flashlight will charge a capacitor or a rechargeable battery that supplies a current to a light source, typically a light-emitting diode or, more rarely, an incandescent light bulb. However, these types of flashlights have been reported to be ineffective because of the low energy.[citation needed]
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