Concepts Of Physics MCQ Edition [Volume 2]PhysicsThermal and Chemical Effects of Electric Current

An electric bulb marked 220 V , 100 W will get fused if it is made to consume 150 W or more. What maximum voltage can the bulb withstand?

Options

A146.7 V
B495.0 V
C330.0 V
D269.4 V

Correct answer

D. 269.4 V

Step-by-step solution

The resistance of the bulb is given by R = V^2 P . Substituting the rated values, R = 220^2 100 = 484 . The maximum power the bulb can withstand before fusing is P_ max = 150 W . The maximum voltage V_ max is given by P_ max = V_ max ^2 R . V_ max = P_ max R = 150 484 = 72600 269.4 V .

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