Understanding Two Coils - V1/V2 & I1/I2 Ratios

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SUMMARY

The impedance ratio of a transformer is determined by the square of the turns ratio, as established in the discussion. For a turns ratio of 100, the impedance ratio calculates to 10,000. The left resistor's interpretation indicates that while Ra remains unchanged, Rb is perceived from the opposite side of the transformer as being increased by a factor of 10,000. This understanding is crucial for analyzing transformer behavior in electrical circuits.

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http://i47.tinypic.com/k0n0gi.jpg
i know that V1/V2=1/a
I1/I2=-a

how they interpret the left resistor
to be like this ?
 
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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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