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Calculate the resistance of the filament of a lamp rates 240 V, 40 W

Physics
WAEC 1990
Calculate the resistance of the filament of a lamp rates 240 V, 40 W
  • A. 240Ω
  • B. 360Ω
  • C. 720Ω
  • D. 1440Ω
  • E. 2880Ω
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Correct Answer: Option D
Explanation
R = V2/P = 2402/40 = 1440Ω
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