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JAMB Physics 1993 Question 8

Question 8

Work, Energy and Power

Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?

  1. A.Electrical → mechanical → potential → light
  2. B.Potential → mechanical → electrical → light
  3. C.Mechanical → sound → electrical → light
  4. D.Kinetic → mechanical → electrical → light
Show the answer and explanation

Answer: B (Potential → mechanical → electrical → light)

Explanation

Water stored behind the dam has potential energy; falling, it turns the turbines (mechanical), the generators produce electrical energy, and lamps turn it into light.