The primary impedance of a step-up transformer as compared to secondary impedance

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The primary impedance of a step-up transformer as compared to secondary load impedance is:

  1. Less
  2. Same
  3. Greater

Correct answer: 1. Less

Explanation:

If N1 and N2 are number of turns of primary and secondary and Zp and Zs are impedance values of primary and secondary. Then

Zp = (N1/N2)2 * Zs

For step up transformer

N2 > N1

Thus

Zp < Zs

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