Energy Efficiency

Energy is available in various forms from different natural sources such as pressure of water, chemical energy of fuels, nuclear energy of radioactive substances etc.All these forms of energy can be converted into electrical energy by the use of suitable arrangement. In this process of conversion, some energy is lost in the sense that it is converted to a form different form electrical energy. Therefore, the output energy is less then the input energy. The output energy divided by the input energy is called energy efficiency of the system.

                                    Output Energy                                                                        
      Efficiency,  Ƞ =   ______________
                                     Input Energy 


As Power is the rate of energy flow, therefore, efficiency may be expressed equally well as output power divided input power i.e.,


                                                                    Output Power
                                        Eficiency, Ƞ  =   ______________
                                                                     Input Power