What do you mean by complex power?

Complex power, represented as ( S ), is a measure of power in AC (alternating current) electrical systems and is expressed in volt-amperes (VA). It combines both real power (P), which does actual work, and reactive power (Q), which oscillates between the source and load without performing useful work. Mathematically, it is defined as ( S = P + jQ ), where ( j ) is the imaginary unit. Complex power provides a comprehensive understanding of power flow in circuits, accounting for both energy consumption and energy storage.