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A 250 V bulb passes a current of 0.3 A. Calculate the power in the lamp.
75 W
50 W
25 W
90 W
75 W
Given: Voltage (V) = 250 V, Current (I) = 0.3 A
Voltage (V) = 250 V, Current (I) = 0.3 A
P=V×I
Identify Given Parameters
Identify the potential difference (Voltage) across the bulb and the current flowing through it.
V=250 V,I=0.3 A
Select Power Formula
Use the fundamental electric power formula for a DC circuit where power is the product of voltage and current.
P=V×I
Substitute and Calculate
Substitute the given values into the formula to calculate the power consumption in Watts.
P=250×0.3=75 W
A is correct because the power calculated by multiplying 250 V by 0.3 A is 75 W.
This fundamental relationship P=VI is the foundation for understanding energy consumption calculations in household electricity bills and sizing electrical components in engineering.