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What are the transformer losses? 
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TRANSFORMER LOSSES - Transformer losses have two sources-copper loss and magnetic loss. Copper losses are caused by the resistance of the wire (I2R).Magnetic losses are caused by eddy currents and hysteresis in the core. Copper loss is a constant after the coil has been wound and therefore a measurable loss. Hysteresis is loss is constant for a particular voltage and current. Eddy-current loss, however, is different for each frequency passed through the transformer.
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