Water is pumped from a lake to a storage
Water is pumped from a lake to a storage tank 20 m above at a rate of 70 L/s while consuming 20.4 kW of electric power. Disregarding any frictional losses in the pipes and any changes in kinetic energy, determine
(a) The overall efficiency of the pump–motor unit and
(b) The pressure difference between the inlet and the exit of the pump.