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Word Count: 370
Appliances that heat up such as a hair dryer a clothes iron toaster electric toaster oven or an electric space heater all work on the same idea They change electrical energy to heat energy The devices all plug into a source of electricity Electric current runs from your wall socket down the wire and into the appliance Inside each of the appliances are loops of special mixture of metals One type is called nichrome Nichrome wire is an alloy of nickel and chromium It has two features that make it a good producer of heat Nichrome wire has a fairly high electrical resistance compared to something like copper wire so even a short length of it has enough resistance to get quite hot The nichrome alloy does not oxidize when heated Iron wire would rust very quickly at the temperatures seen in a toaster Electricity cannot pass through this special metal very easily The metal slows down the electrons and holds up the current flowing through it This is called the resistance of the metal When the resistance of a metal is higher the metal will get hot because of the friction of the electrons in the current of electricity As the electricity is forced through the wires the wires begin to heat up and glow very hot If you look inside your toaster youll see those coils or wire glowing orange Its those coils or loops of wire that cause the bread to brown making your toast In older toasters the hot wires heat up a small device called a thermocouple When it reaches the right temperature which is about the same time as your toast is properly toasted it releases a catch allowing the toast to pop up At the same time it shuts off the electricity In some newer toasters the thermocouple is replaced by a small timer In a hair dryer a small fan is turned on at the same
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