MODULE V
Electrical engineering - Basics Page 20

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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:



Output power ("active power") for three-phase motors:




 

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