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Question

Two bulbs A & B rated [200V, 50W] and [200V, 100W] are connected in series. Which 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; ‘B’ does not

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Solution

The correct option is B

Bulb A


Since in series, the flow of current is constant. We need to compare power with ‘R’.

P = V × I

P = V2R

RA = 220250 = 800 Ω

RB = 2202100 = 400 Ω

Since, current is constant in P = i2 R. More the resistance more will be the power and thus, the bulb glows more brightly.

Hence, Bulb A glows more.


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