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UK mains electricity & current reversals

  1. Apr 8, 2009 #1
    The frequency of UK mains electricity is 50Hz. I know that this means there are 50 cycles per second & so it must change direction 50 times per second but a colleague is adament that this means the current reverses direction 100 times per second. I just can't get it. Can anyone explain this to me?
  2. jcsd
  3. Apr 8, 2009 #2


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    Science Advisor

    The current flows one way through the first half of the sinusoid, and then flows the other way during the other half. These together form one cycle:
  4. Apr 8, 2009 #3
    Thanks - easy when you say it like that.
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