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Question

# Out of two bulbs 50 W, 100 W, which one will glow brighter if (SAT) Connected in series When connected in parallel

A
(a)50 W (b)100 W
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B
(a)100 W (b)100 W
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C
(a)100 W (b)50 W
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D
none of above
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Solution

## The correct option is A (a)50 W (b)100 WFor a given rated voltage bulb, The resistance of 50W rated bulb is much more than that of the 100W bulb.resistance is given by: R=V2P and the total current in the circuit in series is given by: I=VRS where RS=RA+RB as the same current passes through each bulb when connected in series,50W bulb will glow brighter as power, P=I2R, is more in case of 50Wbulb. similarly, when the bulbs are connected in parallel, 100W the bulb will be much brighter as power,P=V2R, is more in case of 100W bulb.

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