A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow brighter?
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Resistance of 25 W bulb is R25=V2/P=(220)2/25=1936Ω
Resistance of 100 W bulb is R100=V2/P=(220)2/100=484Ω
As both bulbs are in series, current through them will be the same. But
resistance of 25 W bulb is more. Hence, from the relation P=I2R, the 25 W bulb will glow more brightly.
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