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JAMB Physics 1980 Question 26

Question 26

Electrical Energy and Power

A stand-by generator is connected to fifteen 40 W lamps and a musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?

  1. A.3.84 kWh
  2. B.7.20 kWh
  3. C.8.40 kWh
  4. D.12.00 kWh
  5. E.14.56 kWh.
Show the answer and explanation

Answer: B (7.20 kWh)

Explanation

Total power = 15 × 40 + 600 = 1200 W = 1.2 kW. Energy = 1.2 × 6 = 7.2 kWh.