GENERAL KNOWLEDGE

Detailed explanation-1: -Nichrome wire is generally used as a heating element in heating appliances because it has the following features: It offers a very large resistance. So a large amount of electric energy is converted into a large amount of heat energy. It has a high melting point such that it can be heated till red hot without melting.

Detailed explanation-2: -Nichrome: Most resistance wire heating elements usually 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.

Detailed explanation-3: -When an electric current passes through the nichrome, it produces a lot of heat due to its high resistance. It has also high melting point so it doesn’t melt even though the amount of heat generated is large.

Detailed explanation-4: -Nichrome is consistently silvery-grey in colour, is corrosion-resistant, has a high melting point of about 1, 400 °C (2, 550 °F), and has an electrical resistivity of around 112 –cm, which is around 66 times higher resistivity than copper of 1.678 –cm.

Detailed explanation-5: -Tungsten; It is extensively used as the filament in incandescent bulbs. They can produce both heat and light. It is considered as the metal with the highest melting point. In some furnaces and arc welding electrodes are using tungsten as a heating element.