Question

what is the cost of running an AC with average power of 1000W for 8 hours for 30 days.the cost of electric energy is 4.50 per KWh

Answer 1

P = 1000
T = 8 hrs
S = P/ T
= 1000/8
= 125

Cost = 125 * 4.50
= 562.5 Rs

Answer 2

The cost is Rs. 1080

Given : The AC with average power of 1000W for 8 hours for 30 days. The cost of electric energy is 4.50 per kWh.

To find : The total cost of running the AC.

Solution :

We can simply solve this numerical problem by using the following process. (our goal is to calculate the total cost)

First of all, we have to calculate the total consumed energy, in kWh unit.

In 1 day the AC consumes = (1000 × 8) = 8000 Wh = 8 kWh

(As, 1 kWh = 1000 Wh)

In 30 days, the AC will consume = Consumption of 1 day × 30 = 8 × 30 = 240 kWh

Now, rest of the calculation will be done in general arithmetic method.

Cost for 1 kWh electric energy consumption = Rs. 4.5

Cost for 240 kWh electric energy consumption = 4.5 × 240 = Rs. 1080

(This will be considered as the final result.)

Hence, the total cost is Rs. 1080