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A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?

1 answer

Power = V²/r watts
so resistance for the 75W bulb
R1 = 120²/75 Ω = 192 Ω

Similarly calculate R2 for the 25W bulb.

Net resistance of two resistors in parallel
R = 1/(1/R1+1/R2)

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