A 250V bulb passes a current of 0.3A. Calculate the power in the lamp.

Question

Examoogle · Accepted Answer

75 W

Explanation: Given: Voltage V = 250V, Current I = 0.3A

Formula Used: $$P = V 	imes I$$

Steps: Identify given parameters: From the problem statement, the voltage $V$ across the bulb is $250	ext{ V}$ and the current $I$ flowing through it is $0.3	ext{ A}$.. Select the power formula: The electrical power $P$ dissipated in a circuit is the product of voltage $V$ and current $I$.. Calculate the power: Substitute the given values into the formula to find the power: $P = 250 	imes 0.3$.

Answer: A is correct because the product of the given voltage of $250	ext{ V}$ and current of $0.3	ext{ A}$ equals $75	ext{ W}$.

Exam Tip: This fundamental relationship $P = VI$ is the foundation for determining energy consumption ($E = P 	imes t$) in domestic and industrial electrical metering.

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