Question

A bulb is rated at 200 volt - 40 watt. what is its Resistance ?5 Such bulbs are lighted for 5 hours. calculate the electrical energy consumed . Find the cost if the rate is ₹5.10 per kwh

Answer 1

V=200v
P=40w
p=v^2 /r
R= (200)^2 / 40
R=1000 ohm

5 such bulbs have power equal to 5*40= 200 w
Energy consumed= E=p*t
200*5=1000 wh
= 1 kwh
We are already given that 1 kwh costs rs. 5.10