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Heat loss by transformer

  1. Apr 9, 2007 #1
    What percentage of electrical energy is lost as heat by the transformer that supplies a house with 240V ac?
  2. jcsd
  3. Apr 9, 2007 #2


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    Science Advisor
    Gold Member

    Small utility transformers must exceed about 98% under newly proposed EPA rules, large ones over 99%.
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