Question

A certain household has consumed 250 watts by 3 bulbs each working 4 hours a day. If it cost rupees 4 per unit then find cost of total uses in the month of February 2017

Answer 1

Energy consumed by 3 bulbs = 3*250 = 750 W
Energy consumed by 3 bulbs for 4h per day till 28 days = 4*750*28 = 84000Wh = 84 kWh
Cost for the bulbs is 4*84 = ₹336