Hello Guys
Please give the solution of this 10 standard question
Q) 2 bulbs rated as 40W,220V and 60W,220V are connected in series with a 220V source. Draw a circuit diagram to show the connections. Which of them will glow brighter and why?
Answers
Answer:
Given: Two bulbs of 40W and 60W are connected in series to an external potential difference.
To find which bulb will glow brighter and why
Solution:
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=
R
V
2
⟹P,R are inversely proportional to each other.
Hence, P
40
<P
60
⟹R
40
>R
60
So, the resistance of 40W bulb is higher than the 60W bulb.
Hence, 40W bulb will glow brighter.
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SIMILAR QUESTIONS
star-struck
Old - fashioned serial lights were connected in a series across a 240V household line.
i) If a string of these lights consists of 12 bulbs, what is the potential difference across each bulb?
ii) If the bulbs were connected in parallel, what would be the potential difference across each bulb?
Medium
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Two bulbs 40W and 60W and rated voltage 240V are connected in series across a potential difference of 420V. Which bulb will work at above its rated voltage