The losses due to resistance of the windings are called what?

The losses due to resistance of the windings are called what?

• A. Copper losses
• B. Iron losses
• C. Hysteresis losses
• D. Eddy currents

Answer: (A)

Copper losses are the heating losses that come from the resistance of the winding conductors when current flows. The power dissipated as heat in the windings follows P = I^2R, so heavier load (larger current) or windings with higher resistance produce more copper losses. These losses can be reduced by using conductors with bigger cross-sections (lower resistance), improving cooling, or design choices that minimize current in the winding. Iron losses, by contrast, happen in the transformer core and are not due to winding resistance. Hysteresis losses come from the repeated magnetization of the core material, while eddy current losses come from circulating currents inside the core. Those are separate from copper losses and are not tied to the winding’s resistance.

Copper losses are the heating losses that come from the resistance of the winding conductors when current flows. The power dissipated as heat in the windings follows P = I^2R, so heavier load (larger current) or windings with higher resistance produce more copper losses. These losses can be reduced by using conductors with bigger cross-sections (lower resistance), improving cooling, or design choices that minimize current in the winding.

Iron losses, by contrast, happen in the transformer core and are not due to winding resistance. Hysteresis losses come from the repeated magnetization of the core material, while eddy current losses come from circulating currents inside the core. Those are separate from copper losses and are not tied to the winding’s resistance.