Transformer rating in kva

Why transformer rating is in KVA?

A transformer is basically rated in Kilovolt-amperes (kVA). An example is a 10 kVA Single phase Transformer, by which, the rating is 10 kVA. Have you wondered why transformers are rated in kVA and not in Kilowatts (kW)?
If we dig deeper into the study of transformers, we will see that the copper loss of a transformer depends on the current, while its iron loss depends on its voltage. Therefore, the total transformer loss, which is the copper loss and the iron loss, depends on the volt-ampere and not on the phase angle between current and voltage. Thus, the transformer losses are independent on the load power factor. It is the main reason why transformers are rated in kVA and not in kW.