Question

Assertion (A): An electric bulb having higher resistance has less power and hence it glows less brightly.

Reason (R): An electric bulb having lower resistance has more power and hence it glows more brightly.

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

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

Explanation:

Household appliances operate on a constant voltage parallel supply, where electrical power is inversely proportional to resistance (P = `V^2/R`). Therefore, the bulb with higher resistance consumes less power and glows dimly (assertion is true), while the bulb with lower resistance draws more current, consumes more power, and glows brightly (reason is true). The reason correctly explains the underlying scientific rule governing the assertion.