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Homework Help: How to find the turns ratio between the primary and secondary coils.

  1. Mar 27, 2013 #1
    1. The problem statement, all variables and given/known data

    Find the turns ratio across the transformer such that a spark is given off at the points AB. The distance from point A to point B is 5.00 mm.

    AB is the distance across the secondary coil.

    The frequency and voltage of the primary coil is given.

    2. Relevant equations

    N_p /N_s = V_p / V_s = I_s /I_p

    3. The attempt at a solution

    I don't know where to start. I got it wrong. I was given the answer, but not the solution to the problem. Could I get some help on where to start?
  2. jcsd
  3. Mar 27, 2013 #2


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    Staff: Mentor

    What potential must exist between points A and B in order for a spark to jump the gap?
  4. Mar 28, 2013 #3

    Thanks for helping. I honestly don't know what I was thinking. I knew the potential of the secondary coil had to be the dielectric constant of air multiplied by the distance AB.
  5. Mar 28, 2013 #4


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    Staff: Mentor

    I think you mean the dielectric breakdown strength of air :smile:
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