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Calculate the amount of heat generated in an external load of resistance  8Ω if an alternating...

Physics
WAEC 1996

Calculate the amount of heat generated in an external load of resistance  8Ω if an alternating current of peak value 5A is passed through for 100s.

  • A. 20,000J
  • B. 10,000J
  • C. 5,000J
  • D. 4,000J
  • E. 200J
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Correct Answer: Option A
Explanation

E=I\(^2\)rt

E=5\(^2\) * 8 * 100

E=20000j

Heat Energy Generated(Q) ⇔ Energy(E)
Q = 20000j

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709