Discussion
An impedance referred from the secondary to the primary of a transformer is multiplied by
Answer: A
Correct answer: the square of the turns ratio
Voltage transforms by the turns ratio and current by its inverse, so impedance, being their quotient, transforms by the square: \( Z_1 = (N_1/N_2)^2 Z_2 \). This is the basis of impedance matching, and it is why per unit quantities are so convenient - expressed in per unit, an impedance has the same value on either side.
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