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Calculate the efficiency of a 500W transformer, which reduces the 230 AC voltage to 24 V. For the calculations, assume the resistances of the primary and secondary windings as 0.05 Ohm and 0.01 Ohm, respectively. The losses in the transformer core Pc = 70mW.

I understand the whole voltage/current/power/impedance ratio stuff, but cant seem to find any information on calculating efficiencies using the resistances or the transformer core losses. Any Suggestions?