Question

and electric bulb is rated 220v and 100w when it is operated on 110v, then power consumed will be??

Answer 1

first we have to find the resistance as it is constant in an appliance:
\[P=V ^{2}/R\]
R=220*220/100=22*22

Answer 2

P=110*110/22*22

Answer 3

=25W

Answer 4

that is the answer

Answer 5

@ashishthomas7 ,Since you are new user, let me tell you something. According to Openstudy Guidelines, you must not be giving out answer's like that. You must be assisting the person to get the answer :)

Answer 6

i thought that this was all about finding the answer

Answer 7

Nope. I recommend you to check the Openstudy website guidelines
http://openstudy.com/code-of-conduct

Answer 8

sorry!anyway thanx..

Answer 9

hi...i am new to open study..hope this can answer your question correctly...
1. the rating of the bulb is 220V,100w right?
from this we can find out the resistance of the bulb...
P=(V^2)/R;
from this equation we can find out resistance R as R=(V^2)/P; substituting voltage and power from the equation we get R as 220*220/100=484 ohms...

now as we apply only 110V supply,the power consumed can be calculated as P=(V^2)/R=(110*110)/484=25W

so the answer is 25W

Answer 10

bt i got a different way of doing that u guys tell me what is wrong with it.
P=VI
100W=220V x I
I=5/11 A

P'=V'I
P'= 110 X 5/11 W
P'= 50W

Answer 11

@retwick current can vary for differnet voltage and power but only one thing that remains constant always is resistance...