When you press the button on an electric torch or flashlight, the first energy conversion comes from the battery itself. Batteries use metal electrodes set into a chemical paste to store electricity;An incandescent light bulb consists of a vacuum-sealed glass chamber with a thin wire filament inside. When electricity passes through the wire, resistance causes it to heat up. This conversion of electricity to heat is the second energy conversion in a typical flashlight. So in order for the torchlight to be able to produce light, the filament must heat up until it glows a bright white, this process is extremely energy inefficient. As much as 95% of the power applied to the bulb is lost as useless heat rather than illumination. That is all for now, stay tuned to my blog and watch out for update of this post. Hope you guys find this post very useful and I believe you guys now know how Torchlight generates light.
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