Question

several electric bulbs designed to be used in a 220V electric supply line are rated at 10W How many lamps can be connected in parallel with each other across 2 wires of 220 V line, if the maximum allowed current is 5 A?
please answer quickly!!!!!!!

Answer 1

Given:V=220V

P=10W

I=5A

Let the no. of lamps be x

We know that, In parallel connection P.D. remains same. Hence,Power of x lamps=Potential

difference(V)

×Current (I)

i.e. P×x=V×I

10×x=220×5

x=220×5÷10

x=22×5

x=110

Therefore,110 lamps can be connected in parallel.