An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its…

Physics WAEC 2006

An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament

  • 480\(\Omega\) checkmark
  • 360\(\Omega\)
  • 60\(\Omega\)
  • 2\(\Omega\)

The correct answer is: A

Explanation

R = \(\frac{V^2}{P} = \frac{240^2}{120} = 480\Omega\)
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