Electrical mathQuestion 1503 of 1506

A motor has a power factor of 0.8 lagging. What is the phase angle between voltage and current?

  1. 38.7 degrees
  2. 72.0 degrees
  3. 78.5 degrees
  4. 36.9 degrees
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Correct answer: 36.9 degrees

PF = cos θ, so θ = arccos(0.8) = 36.9 degrees.

Source: Computed, 11.3: Calculating Power Factor

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Questions last reviewed: 18 October 2026