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Question

# Two bulbs are marked as ‘A’ having rating 60W, 220V & ‘B’ having rating 100W, 220V. They are connected in parallel to a 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

Both will glow with same brightness.

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D

Bulb A glows and B does not glow.

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Solution

## The correct option is (C) Bulb B.Two bulbs are connected in parallel When voltage is constant then P = V2RWe can say that P ∝ 1R so when R increases, power decreases and vice versa. Bulb A: P = V2R ⇒ RA ​= V2P = 220260=806 Ω Bulb B: P = V2R ⇒ RB​ = V2P = 2202100=484 Ω So, RB​ < RA​ ⇒ PB​ > PA​ ⇒ Bulb B will glow brighter.

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