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Unilorin Post-UTME Physics 2024 (Model questions) Question 6

Question 6

Electrical Energy and Power

A 12V battery supplies a current of 3A for 2 hours. How much energy is supplied in kJ?

  1. A.7.2kJ
  2. B.144kJ
  3. C.216kJ
  4. D.259kJ
Show the answer and explanation

Answer: D (259kJ)

Explanation

E = VIt = 12 × 3 × (2 × 3600 s) = 259200 J, which is about 259 kJ.