There is a misconception in the masses that flashlights require batteries to function. Hence, those who are energy conscious choose models which run on rechargeable batteries. But did you know the flashlight can run without batteries too and at an equally optimum level?
How can magnets run flashlights?
In 1830, Michael Faraday, a scientist discovered that when a magnet is passed through a coil an electrical current is induced. Based on this theory flashlights have been created which can be switched on by just shaking them.
How can magnets power the flashlights?
What happens when you shake a flashlight is that a magnet passes back and forth through a coil of wire and induces an electromotive force or an EMF which powers on the flashlight. The force created by shaking is stored in a capacitor in the flashlight and this release the energy when the device is switched on.
How can you use them?
You must shake these flashlights vigorously for three minutes at least for a full charge or a minimum of 30 seconds if the battery is not fully discharged. Once you switch on it will work till the charge diminishes and then you can repeat the shaking to charge it again.
These flashlights usually use LED bulbs which require less power.
Pros and Cons
These flashlights are hardy and can withstand abuse. They are environmentally safe. They are ideal for emergency situations where you won’t be let down by a battery out of charge. The only disadvantage with these lights is that they use very strong magnets which must be kept away from watches, credit cards, and other magnetic materials.
If you are ever asked ‘Are tactile flashlights safe?’ or ‘Are these flashlights safe?’ the answer to both the questions will be the same – they are same but are suited for different purposes. Tactile flashlights are ideal for military use while these flashlights are better suited for hardy life in the outdoors.