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

  • 240Ω
  • 360Ω
  • 720Ω
  • 1440Ω checkmark
  • 2880Ω

The correct answer is: D

Explanation

R = V2/P = 2402/40 = 1440Ω
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