Power factor of an electrical circuit is equal to____________?
Correct answer: E. all of these
- A. R/Z
- B. cosine of phase angle difference be-tween current and voltage
- C. kW/kVA
- D. ratio of useful current to total cur¬rent Iw/I
- E. all of these
Explanation
Power factor can be written as cos φ, kW/kVA, R/Z, or Iw/I, since each represents the in-phase component relative to the total. Therefore all listed expressions are equivalent for a sinusoidal AC circuit.
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