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JEE Main202228 Jul 2022Evening ShiftPhysicsCurrent ElectricityActual

An electrical bulb rated 220 V , 100 W , is connected in series with another bulb rated 220 V , 60 W . If the voltage across combination is 220 V , the power consumed by the 100 W bulb will be about _____ W .

Correct answer

0

Step-by-step solution

Electric power is given by P = V 2 R , here, V is voltage and R is resistance. Now, for each bulb, R 1 = V 2 P = 220 2 100 = 484   Ω and R 2 = V 2 P = 220 2 60 = 484 10 6   Ω Net current through the series combination is I = 220 484 + 484 × 10 6   A = 0 . 171   A Hence, the power consumed by the 100   W bulb is P 1 = I 2 R 1 = 14 . 06   W

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