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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 = V2R

We 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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