Electrical mathQuestion 1370 of 1506

A 3 kW heater runs 5 hours each day for 5 days. How much energy does it use?

  1. 60.0 kWh
  2. 15.0 kWh
  3. 37.5 kWh
  4. 75.0 kWh
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Correct answer: 75.0 kWh

Energy = power × time = 3 kW × 5 h × 5 days = 75.0 kWh.

Source: Computed, 12.3: Power Measurement

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Questions last reviewed: 18 October 2026