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The loss in a distribution cable varies as

  • A.the voltage at its far end
  • B.the length of the cable alone
  • C.the square of the current it carries
  • D.the current it carries, taken directly

Answer: C

Halving the current quarters the loss, which is why power factor correction and load balancing pay twice over: they reduce a squared quantity. Increasing the conductor size reduces the resistance and the loss in proportion.

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