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A current of 2A passes through a wire of resistance 4Ω for 3 minutes. Calculate the...

Physics
WAEC 2021

A current of 2A passes through a wire of resistance 4Ω for 3 minutes. Calculate the energy lost.   

  • A.   960J       
  • B.  1440J     
  • C. 2880J      
  • D. 48J
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Correct Answer: Option C
Explanation

Power = current[I]\(^2\) * Resistance[R] → 2\(^2\) * 4 → 4 * 4 = 16watts

time = 3minutes → 3 * 60 = 180s

Energy = power * time → 16 * 180 = 2880j

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