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JAMB Physics 2010 Question 39

Question 39

Electromagnetic Induction

Power supply is transmitted at a very high voltage and low current in order to

  1. A.increase the power supply.
  2. B.prevent overheating of the coil.
  3. C.make it travel fast.
  4. D.make it pass through the transformers.
Show the answer and explanation

Answer: B (prevent overheating of the coil.)

Explanation

Heat lost in the cables is I2R. Using a small current (at high voltage) cuts this heating and the energy wasted.