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Open circuit experiment

  1. Apr 2, 2010 #1
    http://i44.tinypic.com/142zgg5.jpg

    they say that we can measure aM and R_c

    they say that in a good transformer the power waisted on R_1
    is much smaller then on R_c
    then we can neglect the power on R_c
    so the power measured on the power meter will be the power on R_c

    http://i39.tinypic.com/20zpcvm.jpg

    why
    aM=L_c
    ?
    if we measure the voltage threw those to points
    we need to know the current to get z_eq
    and i dont have short circuit citiation here
     
  2. jcsd
  3. Apr 2, 2010 #2

    berkeman

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    Staff: Mentor

    I think they are just asserting that aM = L_c. I don't know why they labelled it aM in the first place. It's the magnetizing inductance of the transformer, I would think, in parallel with the transformed load resistance.
     
  4. Apr 2, 2010 #3
    i posted it in the wrong sub forum
    damn i am tired
    please move it to tech
     
  5. Apr 2, 2010 #4

    berkeman

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    Staff: Mentor

    No worries, thread moved. Are they just making a definition for us to use?
     
  6. Apr 3, 2010 #5
    no they just say that from the total impedance we could know aM

    but i dont know how?
     
  7. Apr 3, 2010 #6

    berkeman

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    Staff: Mentor

    What does aM stand for anyway?
     
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