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What are copper losses in a transformer?

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Copper loss is the term often given to heat produced by electrical currents in the conductors of transformer windings, or other electrical devices. Copper losses are an undesirable transfer of energy, as are core losses, which result from induced currents in adjacent components. read more

When input power is supplied to the primary of transformer, some portion of that power is used to compensate core losses in transformer i.e. Hysteresis loss in transformer and Eddy current loss in transformer core and some portion of the input power is lost as I 2 R loss and dissipated as heat in the primary and secondary windings, because these windings have some internal resistance in them. read more

Now, a wattmeter measures power into the transformer (shorted secondary) at 11VAC and the power it measures can be assumed to indicate copper losses. Remember, the currents in and out of the transformer are representative of full load because the secondary is shorted. read more

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Copper Loss in Transformer
electronics.stackexchange.com

Losses and Efficiency
www.electricaleasy.com

Losses in a Transformer
engineering.electrical-equipment.org