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Homework Help: 2 coils question

  1. Jan 23, 2010 #1
    i know that V1/V2=1/a

    how they interpret the left resistor
    to be like this ?
  2. jcsd
  3. Jan 23, 2010 #2


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    Science Advisor

    The impedance ratio of a transformer is equal to the square of the turns ratio.

    So, in this case, the turns ratio is equal to 100 so the impedance ratio is 100 * 100 or 10000.

    Ra was there before, so it is unchanged, but Rb is seen from the other side of the transformer as being increased by a factor of 10000.
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