Post-UTME Physics 2018 Objective — Question 4
Question 4 of 20 from the Post-UTME Screening (Post-UTME) Physics 2018 Objective paper, with the correct answer and a full explanation.
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What is the energy generated when a current of 20A flows for 30 seconds through a 50 ohm resistor?
- A. 6.67 kJ
- B. 20.00 kJ
- C. 30.00 kJ
- D. 600.00 kJCorrect
Explanation
Energy = I^2 x R x t = 20^2 x 50 x 30 = 400 x 50 x 30 = 600,000 J = 600.00 kJ.
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