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Transformers voltages homework

  1. Nov 12, 2013 #1
    1. The problem statement, all variables and given/known data
    We have a transformer, the primary coil has 120V and secondary coil has 6V, if you put 8V in secondary coil, what will be the voltage in the primary coil.

    2. Relevant equations
    v1/v2 = n1/n2 where v is voltage and n is turns

    3. The attempt at a solution
    So i was thinking that the number of coils is going to be constant because there is no mention of them changing. So in that case the 120v/6v has to equal x/8v, which you would just solve for x, which comes out to 160v. That seemed kind of simple, so I wasnt sure i was doing that right. Any thoughts?
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 12, 2013 #2


    User Avatar

    Staff: Mentor

    Yup, it's as simple as that for ideal transformers.
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