Post-UTME Physics 2010 Objective — Question 5
Question 5 of 12 from the Post-UTME Screening (Post-UTME) Physics 2010 Objective paper, with the correct answer and a full explanation.
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Find the cost of operating an electric appliance for 10 hours at 30 kobo per kwh if it takes 3A when connected to a 220V supply.
- A. N0.66
- B. N1.32
- C. N1.98Correct
- D. N2.62
Explanation
Power = VI = 220 x 3 = 660W = 0.66kW. Energy = 0.66 x 10 = 6.6kWh. Cost = 6.6 x 30kobo = 198kobo = N1.98.
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