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Network TheoryThree-Phase Circuits

A balanced three-phase system supplies 10 kW at 400 V line voltage and unity power factor. The line current is closest to?

  • A8.33 A
  • B14.43 A
  • C25 A
  • D43.3 A
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Correct Answer: B. 14.43 A
Explanation: P=sqrt(3)VLILcos(phi). At unity power factor, IL=10000/(1.732×400)≈14.43 A.
Reference: Standard network theory: three-phase current numerical
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