Transformer maximum efficiency

Discussion in 'Homework Help' started by andy24691, Dec 9, 2010.

  1. andy24691

    Thread Starter Member

    Nov 25, 2010
    42
    0
    At what value of primary current will maximum efficiency occur in a transformer?

    Would be very grateful if somebody could answer this question for me.

    Thanks
     
  2. Duane P Wetick

    Active Member

    Apr 23, 2009
    408
    19
    Probably the point just below where the transformer goes into saturation is the point of maximum efficiency. More current is drawn when a transformer goes into saturation, but the output remains un-changed.
    The additional current is converted into heat which is to be avoided.

    Cheers, Dpw [ Everything has limitations...and I hate limitations.]
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I have many "western" name-brand wall-warts that are very efficient because they are cold without a load. When loaded they barely get warm.
    But I have a wall-wart that is made in (I am not allowed to say the country) and it is very hot without a load and its voltage without a load is very high. It is very inefficient. It is cheap. Its core is too small and its wire is also too small.
     
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