Find the resistance of bulb rated as $100\, W -250 \,V$.
Find the resistance of bulb rated as $100\, W -250 \,V$.
$P=\frac{V^{2}}{R}$ or $R=\frac{V_{0}^{2}}{P}=\frac{250 \times 250}{100}=625 \Omega$
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