why are transformers rated in apparent power?

Transformers are rated in apparent power (measured in volt-amperes, VA) because they handle both real power (watts) and reactive power (vars) in AC circuits. The apparent power rating reflects the total power the transformer can handle without overheating, regardless of the power factor. This rating is crucial for ensuring that the transformer operates efficiently and safely under varying load conditions, as it accounts for both the active and reactive components of electrical power.