On giving $220\,V$ to a resistor the power dissipated is $40\,W$ then value of resistance is ............... $\Omega$
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(a) $P = \frac{{{V^2}}}{R} \Rightarrow R = \frac{{{V^2}}}{P} = \frac{{{{(220)}^2}}}{{40}} = 1210\,\Omega $
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