A water pump is rated at 750W and is used to fill a rooftop tank for 40min each evening.
a. (i) Determine the electrical energy consumed in a single evening’s operation, giving your answer in joules.
b. (ii) Express the same energy in kilowatt-hours.
c. (iii) Calculate the total energy, in kilowatt-hours, consumed by the pump over 30 consecutive evenings.