The term is applied regardless of whether the windings are made of copper or another conductor, such as aluminium.
The term load loss is used in electricity delivery to describe the portion of the electricity lost between the generator and the consumer[1] that is related to the load power (is proportional to the square thereof), as opposed to the no-load loss.
This states that the energy lost each second, or power, increases as the square of the current through the windings and in proportion to the electrical resistance of the conductors.
Therefore, the energy lost due to copper loss is: where t is the time in seconds the current is maintained.
For low-frequency applications, the power loss can be minimized by employing conductors with a large cross-sectional area, made from low-resistivity metals.