Why are transformer ratings expressed in kVA instead of kW?

Question

Accepted Answer

Transformer rating is in kVA instead of kW because it takes into account both the real power and the reactive power.

kVA represents the apparent power of the transformer, which is the combination of real power (kW) and reactive power (kVAR).
Reactive power is required to magnetize the transformer's core and establish the magnetic field.
The real power (kW) is the power that is actually consumed or used by the load.
The apparent power (kVA) determines the size of the transformer and its ability to handle both real and reactive power.
For example, a transformer with a rating of 100 kVA can handle a load of 80 kW and 60 kVAR.

Accepted Answer

Transformer rating in kva because the transformer losses are two types one in iron loss and another is copper loss, iron losses is affected in voltage and copper losses are affected in current