Questions
A 25 watt ,220 V and a 100 watt ,220V bulbs are joined in series and connected to the mains. Which bulb will glow brighter
detailed solution
Correct option is A
Resistance of 25 watt bulbR1=V2P=(220)225=1936ΩResistance of 100 watt bulbR2=V2P=(220)2100=484ΩBrightness of bulb is directly proportional to i2R.Since same current is flowing through the bulbs , 25 watt bulb will glow brighter.Talk to our academic expert!
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