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Q.

A light bulb is rated at 100W for a 220V supply. Find the resistance of the bulb.

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Detailed Solution

$\begin{array}{l} P = 100 W, V = 220 V \\ P = \frac{V^{2}}{R} \Rightarrow R = \frac{V^{2}}{P} = \frac{220 \times 220}{100} = 484 Ω \end{array}$

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A light bulb is rated at 100W for a 220V supply. Find the resistance of the bulb.