A room heater is rated 100W, 240V. If an electric bulb rated 60W, 240V is connected in series with this heater, what will be the power consumed by the heater and the bulb when supply is at 240V ?
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Power rating = 100W
V²/P = 240*240/100 = 576ohm
Voltage when suppy 240V
V²/R= 240*240/576 = 100W
power consumed = V/R
240/576 = 0.41 A.
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