Electrical Engineering is a free introductory textbook to the basics of electrical engineering. See the editorial for more information....


Author: E.E. Kimberly

The power efficiency of a generator is the ratio of the power output to the power input. It may be expressed as follows:


Inasmuch as power input equals the sum of the power output and the power losses, the efficiency may also be expressed by the following relation:

Efficiency, in


This efficiency is called the conventional efficiency. The efficiency of a generator may be measured by loading, if a calibrated prime mover and a load of sufficient capacity are available. This efficiency is called the direct efficiency.

Last Update: 2010-10-05