Assertion : A 60 W − 220 V bulb glows more than a 100 W − 220 V bulb when they are connected in series across a potential difference. Reason : When they are connected in series, resistance of 100 W bu

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Assertion : A 60 W − 220 V bulb glows more than a 100 W − 220 V bulb when they are connected in series across a potential difference. Reason : When they are connected in series, resistance of 100 W bulb will be more.

TestHub · Accepted Answer

As R ∝ P 1 ​ , resistance of 100 W bulb is less than that of 60 W bulb. Since resistance of 60 W is more, its filament produces more heat and glows more due to higher temperature. Resistance R is inversely proportional to wattage W , i.e., R ∝ 1/ W .

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