Which material is used as heating coil in Electric heating appliances.What are the properties of this material
Answers
Answer:
Nichrome
Nichrome: Most resistance wire heating elements use nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.
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Answer:
Nichrome is nothing but an alloy of Nickel and chromium. It has a special characteristics that it has high boiling point as well as melting point and high resistance. Due to this reason it is used as a heating coil in electrical heating devices , more the resistance in a wire mode is the heat produced.
Nichrome is best suitable and ideal material for making heating element. It is having comparatively high resistance. When the heating element is heated first time, chromium of alloy react with oxygen of atmosphere and form a layer of chromium oxide on outer surface of heating element.
'A piece of Supplementary Counsel' :-
• Properties of Heating Elements =
The working of heating elements is based on heating effect of electric current. When a current is passed through a resistance, it produces the heat.
The required properties in material used for heating elements -
=> High melting point.
=> High tensile strength.
=> High resistivity.
=> Low temperature coefficient of resistance.
=> High ductility to draw the metal or alloy in the form of wire.
Mostly, Nichrome wire is used as a heating element because it is very stable, even at high temperatures. Unlike other metals, it does not melt even when large amounts of heat is passed
• Burning of a heating element =
A dryer's heating element operates on the same principle as the coil in an electric heater. It consists of an uninsulated metal conductor and when an electric current passes through it, its resistance to the flow of electricity makes it heat up. If the coil gets too hot, it burns out.