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Network TheoryCoupled Circuits

An ideal transformer has turns ratio N1/N2=4. A 100 ohm load connected to the secondary is reflected to the primary as?

  • A6.25 ohm
  • B25 ohm
  • C400 ohm
  • D1600 ohm
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Correct Answer: D. 1600 ohm
Explanation: The reflected impedance is Zp=(N1/N2)^2 ZL=4^2×100=1600 ohm.
Reference: Standard network theory: transformer impedance reflection
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