An electric bulb of $500 \,watt$ at $100\, volt$ is used in a circuit having a $200\, {V}$ supply. Calculate the resistance ${R}$ to be connected in series with the bulb so that the power delivered by the bulb is $500\, {W}$. (in $\Omega$)
JEE MAIN 2021, Medium
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${P}={Vi}$
$500={Vi}$
${i}=5 {Amp}$
${V}={i} \times {R}$
${R}=20$
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