Question

Abulb is rated 200v- 40v.what is the resistance?5such bulbs are lighted for 5hours.calculate the electric energy consumed .find the cost if the rate is 5₹ per KWH

Answer 1

R=v^2/w
=40000/40
=4000 ohms

Energy=kwh
=0.04*5
=0.2units
Cost=0.2*5
=1 re.