Red Seal Electrician Practice
Power factor and three-phaseQuestion 1159 of 1506

What is the power factor of a purely resistive circuit?

  1. 0
  2. 0.5
  3. 1
  4. 0.707
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Correct answer: 1

There is no reactive power, so true power equals apparent power. The ratio is 1.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 11.3: Calculating Power Factor

Practice power factor and three-phase

Questions last reviewed: 18 October 2026