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WAEC - Physics (2006 - No. 41)
An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament
480\(\Omega\)
360\(\Omega\)
60\(\Omega\)
2\(\Omega\)
解释
R = \(\frac{V^2}{P} = \frac{240^2}{120} = 480\Omega\)
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