Copper losses are also called what type of losses?

• A. Load losses
• B. No-load losses
• C. Iron losses
• D. Core losses

Answer: (A)

Copper losses are a type of loss in electrical transformers that come from the winding resistance when current flows. Since they depend on delivering power to a load, they’re grouped as load losses. The heat from these losses grows with the current because the power dissipated in the winding is proportional to I^2R.

No-load losses occur even when there’s no secondary current; they come from the magnetic core and related paths and are not due to winding resistance. Iron losses and core losses describe the same core-related phenomena (hysteresis and eddy currents) and are separate from copper losses. So the copper losses are best described as load losses.