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A cable carrying 100 A with a resistance of 0.05 \( \Omega \) per phase dissipates per phase

  • A.5 W
  • B.5 kW
  • C.50 W
  • D.500 W

Answer: D

The square of the current times the resistance is ten thousand times 0.05, that is five hundred watts, and three phases make 1.5 kilowatts continuously. Over a year of continuous running that is over thirteen thousand units.

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