From: dhky@shaw.ca   
      
   On 11/01/2014 6:48 PM, Salmon Egg wrote:   
   > In article ,   
   >   news13  wrote:   
   >   
   >> On Wed, 08 Jan 2014 23:53:57 -0800, Salmon Egg wrote:   
   >>   
   >>> In article ,   
   >>>   uchethegenius1@gmail.com wrote:   
   >>>   
   >>>> How do you derive the efficiency of a transformer from the first   
   >>>> principle of electric circuit.   
   >>>   
   >>> Go to electrical engineering school. When done, read old papers or books   
   >>> on electrical machines i a resarcvh library.   
   >>   
   >> It is usually covered in Transformers 101 and thus is all good EE theory   
   >> books.   
   >   
   > There is a lot of knowledge about transformers that is not found in   
   > electrical machinery books. There is much about insulation, magnetics,   
   > hysteresis, etc. What you will find in such books is ways of testing   
   > transformers without having to run them at full power.   
   >   
   These tests can also give a good handle on an equivalent circuit.   
   Sure there are assumptions made so that results aren't exact but within   
   the limitations of the measuring apparatus, what is exact?   
      
   --   
   Don Kelly   
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