Sine waves in mains transformers

Discussion in 'Homework Help' started by dragon24, Jan 3, 2011.

  1. dragon24

    Thread Starter New Member

    Dec 23, 2010
    6
    0
    Hi there really stuck on this, wondering if anyone could help it. why are sine waves used within mains transformers?. Got an assignment due in a bit, clueless at the moment. I know that transformers operate in AC that's all! quite new to all this! if anyone can help it would be great :D
     
  2. harry99932

    Member

    Dec 30, 2010
    38
    2
    Not sure if im missing something here, mains electricity is alternating current generated by a generator, Im going to say all COMMON rotating electrical generators provide a sine wave output but no doubt someone will find an oddity to prove me wrong:D Its not a case of specifically picking sinewaves for use in transformers as it its a case of thats whats availiable.
    Also sine waves have a lot of nice mathematically properties that make life a lot easier than running mains square wave lol
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    Adding to the above, only the alternating current can excite the inducting coils of a transformer, DC current simply doesn't work.
    Furthermore, a low frequency sine wave is ideal for transformation of power purposes, as it is transformed linearly for the most part. Square and triangular waves contain high-frequency harmonics which saturate and overheat the transformer.

    More on transformers on the resident e-book.
     
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