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Answer Posted / jkn-fixitman
"Copper losses" is just a synonym for the "Load Losses" or
losses due to the flow of load current, predominantly the
I-squared-R losses in the (usually copper) windings. This
differentiates from the "No Load Losses", also known as
"Iron Losses" which are predominantly the hysteresis losses
from magnetizing the (iron) core.
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