Q

A device operates at 2 amperes current and 220 volts potential difference for 5 hours. How much electrical energy does it consume, expressed in kilowatt hours (kWh)?

RRB JE 20/02/2026 / 12:45 PM - 2:15 PM 2026
✓ Answer: A 2.2 kWh
Power = 500 W = 0.5 kW. Energy used in 30 days = 0.5 × 6 × 30 = 90 kWh. At ₹4 per unit, the cost is ₹360.
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