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If the bulbs of 60 W and 40 W are connected in series to a 220 V source the bulb which glows brighter is:
a) 60 W bulb
b) 40 W bulb
c) Both will glow equally bright
d) Depends on the maker of the bulb
The correct answer is option 'B'. Can you explain this answer?
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If the bulbs of 60 W and 40 W are connected in series to a 220 V sourc...
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If the bulbs of 60 W and 40 W are connected in series to a 220 V sourc...
  • Two bulbs of 40 W and 60 W are connected in series to an external potential difference. 
  •  When two bulbs are connected in series, the current I will be the same. But the resistance varies. Higher the resistance brighter the glowing. 
  • P = V2 / R
    ⇒ P, R are inversely proportional to each other. 
    Hence, P40 < P60
    ⇒ R40 > R60
  • So, the resistance of 40 W bulb is higher than the 60 W bulb. So 40 W bulb will dissipate more power and glow brighter.
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If the bulbs of 60 W and 40 W are connected in series to a 220 V source the bulb which glows brighter is:a) 60 W bulbb) 40 W bulbc) Both will glow equally brightd) Depends on the maker of the bulbThe correct answer is option 'B'. Can you explain this answer?
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