Q. Three bulbs of $40\ W,60\ W,\ 100\ W$ are arranged in series with $220\ volt$ supply. Which bulb has minimum resistance
A) $100\ W$
B) $40\ W$
C) $60\ W$
D) Equal in all bulbs
Explanation
(a) $P_{Rated} = \frac{V_{Rated}^{2}}{R} \Rightarrow R \propto \frac{1}{P_{Rated}}\ \ \ \lbrack V - constant\rbrack$
So bulb of high power will have less resistance
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.