Question

the circuit in a house served by a 220V supply line,is protected by a 9A fuse.The maximum number of 60W lamps in parallel that can be turned on is

Answer 1

using the formula
P=VI
P= 220×9 = 1980 W
now the maximum no. of lamps that can be attached to this is
1980/60 =33
hence 33 lamps can be turned on .