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CBSE Class 10 Answered

there are flash lights, which do not need battery to work. then how do they work? what is basically the principle behind this?
Asked by Simran Dhingra | 07 Sep, 2010, 12:00: AM
answered-by-expert Expert Answer

These battery-less flashlights exploit the energy conversion mechanism. They convert some form of energy into electrical energy and store this electrical energy in capacitors.

One type of dynamo-powered flashlight has a winding crank connected to a small electrical generator that charges a capacitor. 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.

Answered by | 07 Sep, 2010, 06:45: PM
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