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Two Transformers, voltage before and after on two different coils

  1. Nov 12, 2013 #1
    1. The problem statement, all variables and given/known data

    We have a transformer with the primary coil carries 120 V and the secondary coil having 6 V. If you change the second coil to have 8V, what is the voltage in the primary coil?

    2. Relevant equations

    My textbook does not have any equations that involve just the voltage of transformers.

    I do have V2=(N2/N1)V1

    Or is just a set up of proportions? Like V1/V2=V1/V2

    3. The attempt at a solution

    120/6=x/8

    so x=160?
     
  2. jcsd
  3. Nov 12, 2013 #2

    Dick

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    Science Advisor
    Homework Helper

    Yes, I think that's the idea. It's not really changing the coil, it's changing the input voltage, but I don't know how else to answer it.
     
    Last edited: Nov 12, 2013
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