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Network TheoryAC Power

A coil has resistance 6 ohm and inductive reactance 8 ohm. Its impedance magnitude and power factor are respectively?

  • A10 ohm and 0.6
  • B14 ohm and 0.8
  • C10 ohm and 0.8
  • D2 ohm and 0.6
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Correct Answer: A. 10 ohm and 0.6
Explanation: |Z|=√(6^2+8^2)=10 ohm. Power factor = R/|Z| = 6/10 = 0.6 lagging.
Reference: Standard network theory: ac power
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