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Homework Help: Primary voltage and transformers

  1. Jun 17, 2010 #1
    Hi physics gurus

    1. The problem statement, all variables and given/known data

    What should the primary voltage be changed to in order to produce a secondary current of 10 A, given that the V / I ratios for the coils do not change?

    Current ratios that I have calculated so far are as follows:

    Np (200) Vp (1200) Is (15)
    Ns (40) = Vs (240) = Ip (3)

    2. Relevant equations

    If focusing on just the IpVp = IsVs ratio - then the solution would be...

    3. The attempt at a solution

    The primary voltage would be changed to 800 V according to my calculation, I would appreciated your advice.

    Cheers P
  2. jcsd
  3. Jun 17, 2010 #2
    Re: transformers

    Yes, you are correct
  4. Jun 17, 2010 #3
    Re: transformers

    Many thanks

    Cheers P
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