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Network TheoryThree-Phase Circuits

A balanced three-phase load draws line current 10 A from a 400 V line at power factor 0.8. Its total real power is closest to?

  • A3.2 kW
  • B4.0 kW
  • C5.54 kW
  • D6.93 kW
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Correct Answer: C. 5.54 kW
Explanation: P=sqrt(3) VL IL cos(phi)=1.732×400×10×0.8≈5542 W=5.54 kW.
Reference: Standard network theory: three-phase power numerical
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