Electrical engineering - Basics Page 20

Module V ServitecStartPrevious pageNext pageEnd

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:


Module V ServitecStartPrevious pageNext pageEnd

• • Copyright © IWB e.V. 1996-2000 • Design, technical realisation and webmaster: • •
• • Sponsored by EDUVINET • 800 x 600 recommended • •