Question

An electric room heater is rated at 2KW. Calculate the cost of using it for 2 hours daily in the month of September when each unit costs 4 rupees.

Answer 1

The total energy consumed= 2kW x 2(Time given 2hrs) x 30(september has 30 days.)
                                       =120kW

So total cost=4 x 120=Rs480

Answer 2

Given :

Power (P) = 2 KW

Time (T) = 2 hours

Cost of each unit = Rs. 4

To Find :

Calculate the cost of using the electric room heater for 2 hours daily in the month of September when each unit costs 4 rupees.

Solution :

We know, Energy consumed (E) = Power (P) × Time (T)

∴ Energy consumed in a month = 2 × 2 × 30

                                                     = 120 KWH

∴ Cost of electrical energy = 120 × 4

                                              = Rs. 480

Therefore, the cost of using the electric room heater for 2 hours daily in the month of September when each unit costs 4 rupees is Rs. 480