WAEC Physics 2021 Objective — Question 23
Question 23 of 50 from the West African Examinations Council (WAEC) Physics 2021 Objective paper, with the correct answer and a full explanation.
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23. A current of 2 A passes through a wire of resistance 4 Ω for 3 minutes. Calculate the energy lost.
- A. 960 J
- B. 1440 J
- C. 2880 JCorrect
- D. 48 J
Explanation
Energy = I²Rt = 2²×4×(3×60) = 4×4×180 = 2880 J.
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