Question

A bulb is marked 110W-220V. The resistance of the filament is:
(a) 110 ohm (b) 220 ohm (c) 440 ohm (d) 2 ohm

Answer 1

P=110W
V=220V
R=?
P=V^2/R
R=V^2/P
R=220×220/110
R=440ohm

Answer 2

Hey...!!!

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According to the question, 

Power = 110W
 
Volts = 220V

Resistance we have to find out..

We, The Formula, P = $v_{s}$/ R


P=Vs^2/R

PR=Vs^2

R = Vs^2/P

R=220×220/110

R=440 Ohms

Hence, Option (c) is your required answer

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Hope This Helps....!!!