Power Factor Formula - Active Power, Reactive Power , Apparent Power - Electrical input

## Sunday, August 5, 2018

POWER  FACTOR  FORMULA

Power  Factor Formula :-  it is the ratio of active power or true power  to the  apparent  power.

Power Factor Formula:-  __ Active power__
Apparent  power

OR

CosÎ¸ =      __ Active power (kW)__
Apparent power (KVA)

Active Power:- it is the actual power consumed or utilized in an circuit is known as active power, active power symbolized by P and measured in the unit of watts (w) .

P = Active Power

Active Power Formulas :-      P = VXI                      (for DC Circuit)
P = V I CosÎ¸              ( for single phase ac circuit)

P=  3 VL IL  CosÎ¸      ( for 3 phase ac circuit )

P = 3 VPH IPH CosÎ¸

P = √ (S2 – Q2

P =√ (VA– VAR2

kW = √ (kVA2 – kVAR2)

Reactive  Power :-  when there is no current or voltage in an ac circuit , reactive power is symbolized by Q and messured in the unit of Volt-Amps- Resistance (VAR).

Q = Reactive Power

Ractive Power Formulas :-  Q = V I SIN 0   positive (+ve) for inductive loads

VAR =√ (VA2 – P2)     negative (-Ve) for capacitive load.

kVAR = √ (kVA2 – kW2)

Apparent Power :-  it is combination of true power and reactive power , apparent power symbolized by S and measured in the unit of Volt-Amps (VA).

Apparent Power Formulas --
S = V I

kVA = √kW2 + kVAR2

Power Triangle :-