An electrical appliance of power 2kW is used for two hours a day. Find the cost that needs to be paid for a month having 30 days if the cost per unit is Rs. 6.25.
Answers
The cost to be paid for 30 days is ₹750
Given : kW used per day - 2kW
Cost per unit -₹ 6.25
To find - cost needs to be paid after 30 days of use
Solution -
Total time the appliance is used - (2hrs) × (30 days ) = 60 hrs
Energy consumed = 2kW × 60 hrs = 120 kWh
But 1 kWh = 1 electric unit
So , 120 kWh = 120 unit
Charge per unit = 120 units × ₹6.25 = ₹ 750
Hence cost for using the electric appliance for 30 days is ₹750
Given: Power Consumption: 2kW per day
Cost per unit: Rs. 6.25
To find: The cost for electricity consumption for 30 days
Solution: To calculate the energy consumption, we need to multiply the total power units consumed by the time and divide it by 1000.
The formula to calculate the power consumption is
Since 1 kW = 1000W
Then, 2 kW = 1000 X 2 W
= 2000W
Now we can substitute the values in the formula
E = P * t /1000
= (2000W x 2 x 60x 60) /1000
= (1440000 w)/1000
= 1440 kwh
The energy consumption is 1440 kwh a day
then
energy consumption for 30 days
E = 1440 x 30 kwh
= 43200 kwh
Cost per unit = Rs. 6.25
For 43200 kwh = Rs. 6.25 x 43200 kwh
= Rs. 270000