Electronic – Transformer size vs. frequency


60Hz transformers are smaller than 50Hz transformers for the same power rating. Transformers designed for operation in the kHz range are even smaller. Why does transformer size decrease with frequency?

Best Answer

Each AC cycle electric energy is converted to magnetic, and back again. The amount of magnetic energy that a transformer can 'store' is more or less linear in its mass. At a higher frequency, more of these cycles occur, hence the same transformer would transform more power, or the same power can be transferred by a smaller transformer.