Q.6 What is Efficiency?

                                                        “What is Efficiency?”

Energy is available in various forms from different natural sources such as pressure head 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 from electrical energy. Therefore, the output energy is less than the input energy.  The output energy divided by the input energy is called energy efficiency or simply efficiency of the system.
                                             Efficiency,  η = Output energy / Input energy

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

                                             Efficiency,  η = Output power / Input power


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