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

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The discussion focuses on the relationship between voltage and current ratios in transformers, specifically V1/V2 and I1/I2. It establishes that the impedance ratio of a transformer is the square of the turns ratio, which is 100 in this case, resulting in an impedance ratio of 10,000. The left resistor's interpretation is clarified, indicating that while Ra remains unchanged, Rb is perceived as increased by a factor of 10,000 when viewed from the opposite side of the transformer. This highlights the significant impact of turns ratio on impedance in transformer circuits. Understanding these ratios is crucial for analyzing transformer behavior in electrical engineering.
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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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