How is the transformer power calculated?

    A transformer is used to transmit electrical energy. It consumes no other electrical energy except for the loss of no-load and the loss of load that occurs during operation (both losses become heat and the temperature of the transformer is added during operation) , so the transformer does not say power, only the rated capacity. Rated capacity of three-phase transformers = rated voltage * Rated Current * rated root number 3(KVA) rated capacity of single-phase transformers = rated voltage * rated current (Kva) rated capacity of transformers indicates that when the load power factor is 1, the maximum power that can be transmitted.