How does a wind up flashlight work?

Wind Up Flashlight
Charlie Cooper / Updated: Apr 8th 2020 / Flashlights

A wind-up flashlight is a flashlight that is also known as a crank-powered flashlight. It uses a battery which powers up the light. This battery usually is rechargeable by the use of a generator turned up using the hand for it to be able to generate energy for use. It does not need to be pumped up continually in order for it to produce light. It is instrumental, especially in cases of emergency since it does not depend on disposable batteries which are limited by shelf life.

History of the Wind-up flashlight

The history of the wind-up torch began in the 1820’s when Michael Faraday was researching on electromagnetic induction. He discovered the concept under which the dynamo or generator flashlights work in this study. Faraday‚Äôs work revealed that dynamic magnetic fields could create electric fields. It led to the creation of the first dynamo or electric generator in 1832. The recent inventions have served to improve the initial model with this concept integrated into the modern-day wind-up flashlights.

How does the wind-up flashlight work?

There are wind up or crank-powered generators which use a battery that occasionally recharged using a DC generator. However, some do not use batteries at all. Their energy is stored in a flat spiral-wound spring when turning the crank. The unwound spring turns a generator which in turn provides power that used to run the light. Several gears attach the handle to the generator enabling speeds to increase.

This device works using the concept of electromagnetic induction. When you turn the crank up, it causes the magnet within the coil wire to spin. The passage of the two surfaces repeatedly causes electrons to be pulled from the magnetic field, causing the creation of electricity. An electric charge then passes to the storage device, either the battery or the capacitor through the wire to power the bulb.