Electrical mathQuestion 1369 of 1506

A 1.5 kW heater runs 8 hours each day for 7 days. How much energy does it use?

  1. 56.0 kWh
  2. 84.0 kWh
  3. 42.0 kWh
  4. 10.5 kWh
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Correct answer: 84.0 kWh

Energy = power × time = 1.5 kW × 8 h × 7 days = 84.0 kWh.

Source: Computed, 12.3: Power Measurement

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Questions last reviewed: 18 October 2026