Certain transformer has full-load copper losses of 500 W. What is the value of the copper loss at half load

Certain transformer has full-load copper losses of 500 W. What is value of copper loss at half load:

  1. 62.5 W
  2. 125 W
  3. 250 W
  4. 750 W

Correct answer: 2. 125 W

Solution: Copper losses vary with the square of current.

Copper loss at half load will be:

(1/2)2 * 500 = 500/4 = 125 Watt

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