Question

3. An electric bulb is rated 220V and 100W. when it is operated on 110V, the power consumed will
a) 100 W
b) 75W
c) 50W
d) 25W​

Answer 1

Answer:

25 W

Explanation:

P=V^2/R

100=220^2/R

R=48400/100

=484Ohm

this resistance due to this bulb is 484 Ohm

P=V^2/R

P=110^2/484

P=12100/484

P=25 W