12. Two lamps, one rated 100 W at 220 V and the other 200 W at 220V are connected (i) in series and (ii) in parallel to electric main supply of 220V. Find the current drawn in each case.
Answers
IN PARALLEL = P1 = 100W V1 = 220V BY, P=VI i1 = 3/11 A
P2 = 60W V1 = 220V BY, P=VI i2 = 5/11A
THEN , TOTAL CURRENT = i1 + i2
3/11A + 5/11A
8/11A
0.72A
IN SERIES = TOTAL POWER = P1 + P2
100W + 60W
160W
BY, P=VI
I = 160/220
TOTAL CURRENT = 0.72A
HOPE IT HELPED....:)