JAMB Physics 2020 Objective — Question 19
Question 19 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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19. If a current of 4A is passed through a thin cable for two hours, how much electrical energy will be converted to heat energy, given that the electrical resistance of the cable is 10 ohms?
- A. A. 4.25MJ
- B. B. 2.15MJ
- C. C. 1.95MJ
- D. D. 1.15MJCorrect
Explanation
H = I^2Rt = 4^2 x 10 x (2x3600)s = 16x10x7200 = 1,152,000J ≈ 1.15MJ.
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