Question

an electric bulb when connected across a power supply of 220 v consumes a power of 60 w if the supply drops to 180v what will be the power consumed

Answer 1

V1=220V
P1=60W
P=V1/R
60w=220v/R
R= 220/60
= 11/3
V2=180V
new Power =V2/R
= 180*3/11
=16.36*3
=49.08W