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  4. 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.

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Q. 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 $500 \, W$.

JEE MainJEE Main 2021Current Electricity

Solution:

$500 $ watt at $100\, v$
image
$P = Vi$
$500= Vi$
$i =5 $Amp
$V = i \times R$
$R =20$