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What is the difference between kW and kVa? The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor. kW is the unit of real power and kVA is a unit of apparent power (or real power plus re-active power).
more commonly quoted in thousands as kW and kVA. kW and kVA in an AC system are only the same when P.F. has a value of one (unity). More frequently equipment is designed to have a PF equal to 0.8. 3.0 Difference Between True Power - kW and Apparent Power - kVA and Reactive Power. In an AC system, such as inductive motors, transformers and solenoids, internal electrical energy is required for. magnetization of items such as a motors field coils.