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Homework Help: Transformer primary-to-secondary turn ratio problem

  1. Apr 21, 2010 #1
    1. The problem statement, all variables and given/known data

    A step down transformer has a primary to secondary ratio of 4:1. If the peak current in the secondary is 12 A, the peak current in the primary is what?


    2. Relevant equations

    Vp/Vs = Np/Ns


    3. The attempt at a solution

    (4/1) = (Ip/12 A)

    what is the relation between I and V? (V= IR or V= IP does not seem to work).

    thanks in advance!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 22, 2010 #2

    kuruman

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    Science Advisor
    Homework Helper
    Gold Member

    In an ideal transformer the power in the primary is the same as in the secondary, P1 = P2. You know that P = IV, so ...
     
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