a 100 W, 220V bulb is operated at 150V. find the resistance of the bulb.

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ashish tiwari

USING THE RELATION,

p = v²/ r

p=100w , v=150v , r=?

100 = 150*150/ r

therefore , r=22500 / 100 =225 ohms

hope so this is the answer.........

vignesh the cooler version of newton

hey, the bulb gives 100 W at 220 Volts

hence, P = V^2 / r

P = 100 W , V = 220 V .....

r = V^2 / P

r = 220*220 / 100

r = 48400/100

or r = 484 ohms....

resistance of the bulb is 484 ohms....

when it is operated at 150 V , power = 150*150 / 484

i.e powe rwud be around 46.5 W .....

Anirudh Kumar

P= V²/R

V= 220 V

P = 100 W.

thus, R= 484 ohm.

at voltage you operate. resistance remians same.