Definition of Transformer LossesLosses in a transformer include electrical losses such as core losses and copper losses, which are the difference between input and output power.Copper Loss in TransformerCopper loss is the I²R loss occurring in the primary and secondary windings of the transformer, depending on the load.Core Losses in TransformerCore losses, also known as iron losses, are fixed and do not vary with the load, depending on the core material and design.Kh = Hysteresis constant.Ke =