If you are a firm believer of the go-green concept then, certainly, your go-to flashlight is the wind-up flashlight! Why because this flashlight can operate without a battery and therefore, no problem of disposal and no harmful effects to the environment! But, few types might include rechargeable batteries in them to store the produced mechanical energy but, again, it’s only a choice and you can perfectly choose to avoid it to support your go-green motive! So, how do these operate then? Let’s see in detail!
The energy stored in the supercapacitor of the wind-up or the hand-crank flashlight is used in illuminating the flashlight! But, where does this energy comes from? The energy comes from the wind-up operation of the wheel or the motor present in the device. That is, when you turn the hand crank on the flashlight, your mechanical action generates the energy, which is stored predominantly, in a supercapacitor if rechargeable batteries are not your choice to illuminate the flashlight for a longer duration! This means, even if the capacitor wears out, if you could continue with your mechanical operation then, the flashlight could illuminate perfectly!
Typically, with the choice of the supercapacitor, just one minute of winding up can offer you 30-90 minutes of uninterrupted illumination that also depends upon the type of bulb used! Generally, the LED bulb types can produce more output for the same duration of winding up or the hand crank motion and therefore, widely preferred by most of them!