Question

An electric heater draws a current of 10A from a 220V supply. What is the cost of using the heater 5 hrs per day for 30 days if the cost of 1 unit is RS. 2.50?

Answer 1

Working hrs per day =5

Total working hrs for 30 days = 30 × 5= 150 hours

power = current x voltage
=10 x 220 = 2200 W

Energy = Power × Time
= 2200 W × 150 h
=330000 Wh
=330 kWh

Cost = 330 kWh × ₹2.50 / kWh
= ₹825