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Voltages and Turns in a Transformer

  1. Jul 24, 2011 #1
    In a step-up transformer, should the ratio of the voltages be approximately equal to the ratio of the number of turns? Why?

    Same for a step-down transformer: should the ratio of the voltages be approximately equal to the ratio of the number of turns? Why?

    Thanks
     
  2. jcsd
  3. Jul 24, 2011 #2

    rock.freak667

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    For starters how does Faraday's law apply to the transformer in either the primary or secondary side?
     
  4. Jul 24, 2011 #3
    Faraday's law includes the rate of change in magnetic flux through the coil and the number of turns in the coil. I think that the ratio of the secondary emf over the primary emf should equal the ratio of the secondary turns divided by the primary turns; so they should be equal for step-up and step-down. Is my thinking right?
     
  5. Jul 24, 2011 #4

    rock.freak667

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    Yes they will be the same for any transformer (ideal).

    For a step up transformer, the number of turns in the secondary > number of turns in primary so the voltages will change accordingly but the ratios of Ns/Np will remain the same.
     
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