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JAMB Physics 1987 Question 10

Question 10

Work, Energy and Power

Figure 3 above represents the main sequence of energy conversion at Kainji Dam. The efficiency of the system is

Diagram for this question
  1. A.Q1/Q2
  2. B.E/Q1
  3. C.E/(Q1 − Q2)
  4. D.E/(Q1 + Q2)
Show the answer and explanation

Answer: B (E/Q1)

Explanation

Efficiency = useful output ÷ total input. The input is the kinetic energy Q1 brought in by the water and the useful output is the electrical energy E.