A heater is rated at 220 V and 1000 W. If it is connected to a 110 V supply, what will be the power consumed by the heater?
250 W
The rated power of the heater is 1000 W at 220 V, so its resistance can be found using P = V²/R, giving R = (220)²/1000 = 48.4 Ω.
The resistance of the heater's coil stays the same when connected to a lower voltage supply of 110 V.
Using the same formula, the new power consumed is P = V²/R = (110)²/48.4 = 12100/48.4 = 250 W.
Hence, the correct answer is 250 W.
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