Electrical mathQuestion 1371 of 1506

A 3 kW heater runs 5 hours each day for 14 days. How much energy does it use?

  1. 210 kWh
  2. 195 kWh
  3. 70.0 kWh
  4. 42.0 kWh
Show answer

Correct answer: 210 kWh

Energy = power × time = 3 kW × 5 h × 14 days = 210 kWh.

Source: Computed, 12.3: Power Measurement

Practice electrical math

Questions last reviewed: 18 October 2026