DOCA0257EN-00

Active Power, Reactive Power, and Apparent Power

Three-Phase Motor

The formula for active power, reactive power, and apparent power for the three-phase motor are as follows:

  • The active power, also known as true power, measures average RMS power. Total active power for three-phase motor P (kW) is derived from the following formula:

  • The reactive power measurement Q (kVAR) is derived from the following formula:

  • The apparent power measurement S (kVA) is derived from the following formula:

Single-Phase Motor

The formula for active power, reactive power, and apparent power for the single-phase motor are as follows:

  • Active power: P (kW) = |(VL1 x IL1 x cosφ)|

  • Reactive power: Q (kVAR) = |(VL1 x IL1 x sinφ)|

  • Apparent power: S (kVA) = |(VL1 x IL1)| 

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