A 25 W , 220 V bulb and 100 W , 220 V bulb are joined in series and connected to the mains. Which bulb will glow brighter -

Question

A 25 W , 220 V bulb and 100 W , 220 V bulb are joined in series and connected to the mains. Which bulb will glow brighter -, 25 W bulb, 100 W bulb, First 25 W bulb and then 100 W bulb, Both will glow with same brightness

MARKS App · Accepted Answer

(Brightness) ∝ (Consumed power) .....(i) For series combination P c o n s u m e d = i 2 R ∴ P c o n s u m e d ∝ R ......(ii) Also, Rated Power P R a t e d = V 2 R P R a t e d ∝ 1 R .....(iii From, (i), (ii) and (iii) B r i g h t n e s s ∝ 1 P r a t e d ∴ 25 W bulb will glow brighter.

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