Electrical mathQuestion 1193 of 1506

A 2 kW heater runs for 5 hours. How much energy does a watt-hour meter record?

  1. 2.5 kWh
  2. 0.4 kWh
  3. 10 kWh
  4. 7 kWh
Show answer

Correct answer: 10 kWh

Energy = power x time = 2 kW x 5 h = 10 kWh.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.3: Power Measurement

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Questions last reviewed: 18 October 2026