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Calculate the time in which 4.8 kJ of energy would be expended when an electric...

Physics
WAEC 1992
Calculate the time in which 4.8 kJ of energy would be expended when an electric heater of resistance 1.8 x 103Ω is used on a 240 V mains supply. (Neglect heat losses to the surrounding).
  • A. 150.0s
  • B. 90.0s
  • C. 36.0s
  • D. 20.0s
  • E. 2.7s.
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Correct Answer: Option A
Explanation
E = V2t/R
t =
ER/V2
=
4800 x 1.8 x 103/240 x 240
= 150s
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts