Sine waves in mains transformers

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

  1. dragon24

    Thread Starter New Member

    Dec 23, 2010
    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


    Dec 30, 2010
    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


    Nov 25, 2009
    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.