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My Deconstructed Torch

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This the case and as you can see it is made out of plastic. The reason why plastic is such a common material is because is cheap compared to most materials and it is also easy to put into mass production. As you may know there are many different types of plastics, some are thin and easy to melt or snap and some are tough and hard to melt or snap and this torch is made out out of polystyrene and that is one of the most well known plastics. The method of assembly is called injection molded and that is where the plastic is made into liquid form and is left in the correct shape the solidify. m.youtube.com YouTube
This is the light bulb and it is an LED bulb. The reason why we use LED bulbs is because they are more powerful then sodium bulbs and they also use less power then sodium bulbs. www.greenenergygeneration.co.uk LED Lighting Information from Green Energy Generation Limited.
These are the batteries, they're covers are made out of Styrene Acrylonitrile because it is easy to colour. The metal is Nickel-metal Hydride (NiMH): This is another type of rechargeable battery that uses nickel and a hydrogen absorbing alloy of some kind, usually a mix of different metals. These types of batteries are slowly replacing Nickel-Cadmium type batteries. stlenergy.org
This is called the aluminum reflector and the material is normally aluminum in a high quality flashlight, but in most torches it made out of plastic. www.bpf.co.uk Plastipedia - The Web's Largest Plastics Encyclopedia featuring information on Additives, Polymers, Standard Abbreviations, Plastics Translations, Plastics Applications, Plastics Processes, Bio-based and Degradable Plastics
if you think about it the first torch was invented in 1899 by David Misell, but it wasn't very well designed. for instance, there was no grip but instead there was just a tube of metal and you would have definitely been electric shocked every time that you turned on. but modern day torches like this have special LED lights to save energy and rubber grips to make it easier to keep in your hand and massive batteries so it would probably have around about 24 hours.