Power factor and three-phaseQuestion 1154 of 1506

A load has 3 kW of true power and 4 kVAR of reactive power. What is its apparent power?

  1. 5 kVA
  2. 7 kVA
  3. 1 kVA
  4. 12 kVA
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Correct answer: 5 kVA

The three powers form a right triangle. S = sqrt(3 squared + 4 squared) = 5 kVA.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 11.2: True, Reactive, and Apparent Power

Practice power factor and three-phase

Questions last reviewed: 18 October 2026