MODULE V 

3.3 Efficiency
Measurement unit 
,
%


or percent

Unit symbol  Efficiency ratio "Eta" 
The efficiency
ratio describes the
relationship between power yield and power expenditure. The efficiency ratio
is always smaller than 1 or 100%.
Diagram 24: Efficiency ratio
Taking the
efficiency ratio into
consideration the above mentioned power formulas have to be extended as follows:
Output power ("active power") for alternating current motors: