Question

Assertion (A): Nichrome alloy is used for making the heating elements of electrical appliances such as electric iron, toaster, electric kettle, room heaters, water heaters (geysers) and hair dryers, etc.

Reason (R): Nichrome alloy has a very low resistivity due to which the heating element made of nichrome produces a lot of heat on passing electric current.

Options

• Both A and R are true and R is correct explanation of the assertion.

• Both A and R are true but R is not the correct explanation of the assertion.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is true but R is false.

Explanation:

The assertion is true because nichrome is widely used in heating appliances due to its high melting point and resistance to oxidation at high temperatures. However, the reason is false because nichrome actually has a high resistivity, not low, which causes it to oppose current and produce a large amount of heat energy (H = I²Rt).