learn.howToCalculate
learn.whatIsHeading
Measures reactive vs. real power in AC circuits showing energy efficiency. Power factor <1 wastes electricity and increases utility costs.
Formule
Power factor = P ÷ S
- P
- P value — Variable used in the calculation
- S
- S value — Variable used in the calculation
Guide étape par étape
- 1Real power (P) in watts
- 2Apparent power (S) in VA (volts × amps)
- 3Power factor = P ÷ S
- 4Cosine of phase angle between voltage and current
- 5Range 0-1; closer to 1 is better
Exemples résolus
Entrée
P=1000W, S=1200VA
Résultat
PF=0.833
Erreurs courantes à éviter
- ✕Assuming residential power factor matters (most don't measure)
- ✕Not measuring true power with calibrated meters
Questions fréquentes
How does low power factor increase costs?
Utilities charge penalty for PF <0.95; also increases I²R losses in distribution.
How do I improve power factor?
Add capacitors to offset inductive loads (motors, transformers) or use synchronous motors.
Prêt à calculer ? Essayez la calculatrice gratuite Power Factor
Essayez-le vous-même →