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CBSE Class 10 Answered

2 electric bulb a and b are marked 220V,60W and 220V,100W. which one of the following will glow brighter in series and in parallel.why? elaborate it.
Asked by | 13 Sep, 2011, 07:29: PM
answered-by-expert Expert Answer
Since the bulbs are in series, same current will pass through each bulb.
But, we know that P = V2 / R.
also, Heat dissipated = I2 R.
Now, since both the bulbs are connected across the same voltage supply (220 v), resistance of 60 W bulb shall be more and it shall dissipate more heat and hence glow brightly.
Answered by | 14 Sep, 2011, 12:17: PM

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