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Question

An electric bulb is rated $200 V - 100 W$ . Find the resistance of the bulb.

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Solution

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Characteristics of the bulb is given as $V = 200$ volts and $P = 100$ watt
Resistance of the bulb $R = \frac{V^{2}}{P}$
$∴$ $R = \frac{(200)^{2}}{100} = 400 Ω$

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