The power relationship on a transformer states that Power in = power out + loss.
The ratio between output voltage and input voltage exists the exact as the ratio of the number of turns between the two windings
The efficiency of a transformer exists reflected in power (wattage) loss between the primary (input) and secondary (output) windings. Then the consequent efficiency of a transformer stands equivalent to the ratio of the power output of the secondary winding, PS to the power input of the primary winding, PP and exists thus high.
Therefore, the correct answer is option A) Power in = power out + loss.
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