Have you heard about the shake torch? No? Well, it is a torch which is very unique, because, it does not require any batteries to power on. All you need to do is to shake it (for about 45 seconds only), and the flashlight will give you about five minutes of bright light! Cool isn’t it? If you need continuous light then you would need to shake the torch every two or three minutes. Not only will you get light, but you will also give some exercise to your arms! You must be wondering how shaking helps the flashlight to switch on. Apparently a sliding magnet moves back and forth inside a spool of three dimensional copper wires, inside the shake torch. Current is then induced through the loops in the copper wire to create a current (Faraday’s law of induction). This current produced charges the capacitor, which basically acts as a short-term battery. Finally, it is this charged capacitor which powers on the flashlight bulb. Since it is water resistant the shake torch can safely be taken for your outdoor trips, camps, picnics, and boat rides. You can even secure it around your wrist or even fix it to your belt with the small lanyard which is attached to the torch. Go ahead and buy this eco-friendly shake torch retailing at £5.95 from the Gadgetshop and say goodbye to cumbersome batteries. Source
