The SI unit of apparent power is the **volt-ampere (VA)**.
Apparent power is a combination of both real power (active power) and reactive power in an AC (alternating current) circuit. It is calculated as the product of the RMS (root mean square) voltage and current, without considering the phase difference between them.
So, the unit of apparent power is simply **volt-ampere (VA)**, which is the product of volts (V) and amperes (A).