Question

2 electric bulbs rated 100 W ,220V and 60W,220V are connected in parrallel to an an electric main of 220V find the current drawn by the bulb from the mains

Answer 1

P = 100W

V =220V

P'= 60 W

V'= 220V

P =VI

100 = 200* I

100/ 220 = I

I = 100/220

P'= V'I'

60 = 220 I'

I'= 60/220

Adding both the current

I = 100/220 + 60/220

=160 /220

=0.7 A

Answer 2

In first bulb.

P= VI

100 = 220 X I

I= 100/220

I = 0.45 A

I'm second Bulb.

P=VI

60 = 220 X I

I = 60/220

I= 0.27 A

The total current = I of fist bulb + I of second Bulb.

= 0.45 + 0.27

= 0.72 A

Hope it helps.