How are airplane alternating current generators rated?

Airplane alternating current generators are rated in kilovolt-amperes (KVA) because this unit represents the apparent power output of the generator. KVA measures both the voltage and the current capacity of the generator, allowing for a comprehensive representation of its capabilities.

In aviation, alternating current generators need to handle the varying loads that different systems may require, hence KVA provides a better understanding of how much power can be supplied without necessarily being limited to the real power, which is measured in kilowatts. The KVA rating specifically accounts for both the active (real) power and the reactive power in the system, which is critical for maintaining efficiency and reliability in aircraft electrical systems.

Using kilowatts would only reflect real power, not taking into account the full capacity of the generator when reactive components are involved. Similarly, volts, while important, only measure electrical potential and do not reflect the capacity to do work or supply power effectively, and hertz identifies the frequency but does not relate to how much power the generator can output. Thus, the kilovolt-amperes rating is the most appropriate and relevant measure for the performance of airplane alternating current generators.