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Here, K means Kilo and refers only to magnitude. VA is Volt * Ampere. VA is complex power or apparent power if you like. Complex power (S) is made up active (P) and reactive (Q) power like S = P^2 + Q^2. All power really is complex power but it is still more common to simply use the term power and only consider active power. Active power is measured in Watt and represents the power that does the actual work. A heater for example draws almost only active power and has a power factor very close to 1. A motor on the other hand draws a significant amount of reactive power. When designing a power transmission to serve reactive load, S must be considered since it will represent the total power and be larger than P only.

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15y ago

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