A regular house holds water pump of 3 horse powers have a power rating of 2.24kW, if we take the total mechanical efficiency of the pump as 90% of the input power the result will be 2.49kW of energy will be consumed. The number of units of electrical energy consumed for 2 hours will be equal to 2.49 units. One unit of electricity will cost you around Rs. 6 on average in India. If you run the motor for two hours, you are spending around Rs 12day for the whole month. This will result in an energy bill of