Question

in an household an electric bulb of 100 W is used for 10 hours and an electric heater of 1000W is used for 2 hours . calculate 1- ) the cost of using bulbs and the heater for 30 days .take the cost of one unit of electrical energy as 5 rupees.?

Answer 1

here is your answer.hope it will help.

Answer 2

Energy used by heater =100wx(10hx30days) =30000wh =30unit

Energy used by bulbs =1000w(2h ×30days) =60kwh =60units

Total Energy = 60+30 =90Units

Cost =90×5 =450 rupees