Q12 of 19 Page 12

Two electric bulbs A and B are marked 40 W – 220 V and 60 W – 220 V respectively. Which one of the two has a greater resistance? ( CBSE 2016)

We Know that,
Power,  
we get,
Resistance (R) =


⇒ Resistance (RA) =


⇒ Resistance (RB) =


∵ 1,210 (RA) > 806.67 (RB)

The bulb with higher power will glow brighter.

∴ Electric Bulb A has the greater resistance

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