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Question

# Two bulbs A and B are marked as ‘A’ 60W, 220V & ‘B’ 100W, 220V are connected in parallel to 220 V source. Which of the two will glow brighter?

A

Bulb B

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B

Bulb A

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C

Same brightness

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D

‘A’ glows but ‘B’ does not

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Solution

## The correct option is A Bulb B When voltage is constant then P = V2R P ∝ 1R so, when resistance increases, power decreases and viceversa For Bulb A: P = V2R ⇒ RA ​ = V2P = 220260 = 806 For Bulb B: P = V2R ⇒ RB​ = V2P = 2202100 = 484 So, RB < RA​​ ⇒ PB​ > PA​ ⇒ Bulb B will glow brightly

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