Question

an electric bulb is rated 220 V 200 W. Calculate the power consumed when it is operated at 110 V.​

Answer 1

Answer:

hope this helps.....................

Answer 2

Explanation:

Solution : R=V2/P

= (220)2/100

= 484 Ω

The resistance of the bulb remains constant

if the supply voltage is reduced to 110 V then Vʹ=110 V

the power consumed by it is given by the expression = Vʹ2/R

= (110)2/484 = 25w