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JAMB Physics 1983 Question 21

Question 21

Electromagnetic Induction

It is usual to transmit electric power at high voltage and low current. Which of the following are possible advantages of the method? I. Heat losses are reduced because the currents are small II. Thin wires can be used because small currents are flowing III. The power can flow faster because the voltage is high

  1. A.I only
  2. B.I and II only
  3. C.II and III only
  4. D.I and III only
  5. E.I, II and III.
Show the answer and explanation

Answer: B (I and II only)

Explanation

Small currents mean small I²R heat losses and allow thinner, cheaper cables. Power does not 'flow faster' at high voltage.