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TeachMeFinance.com - explain Efficiency Efficiency The term 'Efficiency' as it applies to the area of reclamation can be defined as ' Ratio of useful energy output to total energy input, usually expressed as a percent. Effective operation as measured by a comparison of production with cost'. The term 'Efficiency' as it applies to the area of photovoltaics can be defined as ' The ratio of output power (or energy) to input power (or energy). Expressed in percent'. Previous 5 Terms: Effective porosity Effective Precipitation Effective Terrestrial Radiation Effective Topography efficacy Next 5 Terms: efficiency (mathematical) Efficiency, plant Efficient effluent Effluent About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.