Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time combination is connected to a 220 volt AC supply line. The power drawn by the combination in each case respectively will be:
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Question

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time combination is connected to a 220 volt AC supply line. The power drawn by the combination in each case respectively will be:

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G1 Physics · Accepted Answer

Step 1: Each bulb resistance R = 220²/100 = 484 Ω. Step 2: In series, Rₛ = 968 Ω ⇒ Pₛ = 220²/968 = 50 W. Step 3: In parallel, Rₚ = 242 Ω ⇒ Pₚ = 220²/242 = 200 W.