The resistor of resistance '$R$' is connected to $25\, V$ supply and heat produced in it is $25\, J/sec$. The value of $R$ is .......... $\Omega $
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$P = \frac{{{V^2}}}{R}$ $ \Rightarrow $ $R = \frac{{{V^2}}}{P} = \frac{{25 \times 25}}{{25}} = 25\,\Omega $
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