Power Factor (Cosθ) – Cos fi or P.f
In Electrical Engineering, Power Factor is only related to AC Circuits i.e. There is no Power Factor (P.f) in DC Circuits due to zero frequency.
Power Factor may be defined by three definitions and formals as follow.
- You may also read: Is Reactive Power Useful?
1). The Cosine of angle between Current and Voltage is called Power Factor.
- P = VI Cosθ OR
- Cosθ = P / V I OR
- Cosθ = kW / kVA OR
- Cosθ = True Power/ Apparent Power
2). The ratio between resistance and Impedance is Called Power Factor.
Cosθ = R/Z
3). The ratio between Actual Power and Apparent Power is called power factor.
Cosθ = kW / kVA
Power Factor Triangle and Examples
Click image to enlarge
Beer analogy of active or true power, reactive power, apparent power and power factor.
Chips bag analogy of real or true power, reactive power, apparent power & power factor.
You my also read about:
- Active, Reactive, Apparent and Complex Power. Simple explanation with formulas.
- Causes of low Power Factor
- Disadvantages of Low Power Factor
- Power Factor improvement Methods with Their advantages & Disadvantages
- Advantages of Power factor improvement and Correction
- How to Calculate the Suitable Capacitor Size in Farads & kVAR for Power factor Improvement
- CAPACITOR BANKS – CHARACTERISTICS AND APPLICATIONS
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