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Why we are using single phase & three phase

  1. May 26, 2012 #1
    Why we are using Three phase & single phase instead of using two phase , four phase, five phase.
     
  2. jcsd
  3. May 26, 2012 #2

    dlgoff

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    Welcome to Physics Forums.

    It's a trade-off between efficiency and cost.

    http://en.wikipedia.org/wiki/Three-phase_power

    http://en.wikipedia.org/wiki/Polyphase_system
     
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