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Define the percentage voltage regulation and efficiency of a power transformer. 

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Voltage regulation is the difference between no load voltage and full load voltage by no load voltage.

Voltage regulation = No load voltage – Full load voltage / No load voltage. 

Voltage regulation is mentioned in % (percentage).

% Voltage regulation = No load voltage – Full load voltage * 100 / No load voltage. 

Efficiency of a transformer is the ratio of output in watts and input in watts.

Efficiency = Output in watts / Input in watts. 

% Efficiency = Output in watts * 100 / Input in watts. 

% Efficiency = Output in watts * 100 / Output in watts + losses. 

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