Autotransformer - power transferred by conduction/induction

  1. 1. The problem statement, all variables and given/known data
    Upon finding my max. rated output power, and after finding the power transferred by conduction, can i just use:
    Output power - power transferred by conduction = to get my power transferred by induction?

    or do i have to apply the formula where, S = E1I1 = E2I2?


    3. The attempt at a solution

    I am not sure if i did the question correctly, but in the answer given to me, they used "Output power - power transferred by conduction" to get power by induction. however, when i did my working using the formula "S = E1I1 = E2I2", my answer was different.
     
  2. jcsd
  3. NascentOxygen

    Staff: Mentor

    Hi killerdevil. There is a worked example at the foot of this page that will slay you. :smile:
     
  4. when they state power transformed, are they referring to the power delivered at by induction? therefore they use power conducted - power transformed = power conducted??
     
  5. NascentOxygen

    Staff: Mentor

    Let's work it out.

    Their equation is: Power Transformed = Load × (1–K)

    If K=1 you know we would be dealing with a 1:1 turns ratio, and you know for a 1:1 turns ratio that power by induction is going to be zero. What does their equation give for K=1? It says Power Transformed = 0.

    So it looks like "power transformed" is that delivered by transformer action, i.e., by induction. [​IMG]
     
  6. so when does the equation for conduction comes in? how is induction related to conduction? what is the difference between power delivered by conduction and power delivered by induction?
     
  7. NascentOxygen

    Staff: Mentor

    When K=1, you saw that zero power is transformed by induction. Therefore all the power in the load is delivered by conduction directly from the mains--no transformer coil involved.

    What power on the load side isn't due to induction must be due to conduction.
     
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