Why is nichrome commonly used as the heating element in electric heaters?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. It offers high resistivity and a high melting point.
Nichrome is widely used as a heating element because it combines two essential properties—high resistivity and a high melting point. High resistivity means the material opposes the flow of electric current strongly, which leads to the generation of more heat when current passes through it (as per Joule’s law of heating). At the same time, its high melting point allows it to withstand very high temperatures without melting or getting damaged. Additionally, nichrome forms a stable oxide layer when heated, which prevents further oxidation and increases its durability. These characteristics make it efficient, long-lasting, and safe for use in electric heaters, toasters, and similar heating appliances.