Question

An electric bulb is rated 220v and 200w power consumed by it when operated on 110v is what

Answer 1

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Power is 2W

Answer 2

p = v^2/r

200 = 220 × 220 / r

r = 220 × 220 / 200

r = 242 ohm

power in 110 v =>

p = v^2 / r

p = 110 × 110 /242

p = 50 w