An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament
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Correct Answer: Option A
Explanation:
R = \(\frac{V^2}{P} = \frac{240^2}{120} = 480\Omega\)
R = \(\frac{V^2}{P} = \frac{240^2}{120} = 480\Omega\)