Q

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?

RRB Group D 09 Aug, 2026 (12:45 PM - 2:15 PM) 2026
✓ Answer: C 250 W
For a fixed-resistance heater, P is proportional to V². Halving the voltage makes the power one-fourth: 1000 × (110/220)² = 250 W.
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