Definition
The electrical power lost as heat in the copper windings of a generator, motor, transformer, or other electrical device due to the resistance of the copper wire as current flows through it. Copper loss equals the current squared multiplied by the resistance of the windings (I²R), and it increases sharply as current rises.
Plain English
When electricity flows through copper wire, some of it turns into heat instead of doing useful work. That wasted energy is called copper loss. The more current you push through, the more heat you lose.
Context Anchor
Seen in aircraft electrical system discussions, especially when studying generators, alternators, motors, and transformers.
Derivation
Called copper loss because the windings in most electrical machines are made of copper wire, and the loss occurs in that copper due to its resistance. The name points directly to where the energy is being wasted.
Why Pilots Care
Reduces the efficiency of aircraft electrical generation, potentially increasing fuel consumption or affecting system performance under high loads.
Grounding Statement
When an aircraft electrical component carries current, some of that electrical energy warms the wire instead of powering the equipment.
Intuition Check
Copper loss does not mean copper is physically disappearing. It means electrical power is being lost as heat in copper conductors.
Example Sentence 1
Copper loss in the generator windings increases as the electrical load on the system grows.
Example Sentence 2
Mechanics calculate copper losses to determine if rewinding the generator is necessary for optimal performance.