Certified Pool Operator Practice Test

The correct answer is the impeller. The impeller is the rotating part of a centrifugal pump that is responsible for increasing water's velocity, therefore converting kinetic energy to pressure energy. This increase in pressure allows the pump to move water from a lower pressure to a higher pressure region. The suction port, volute, and wear ring are all incorrect options because they perform different functions and do not convert energy from velocity to pressure. The suction port is where the water enters the pump, the volute is the curved casing surrounding the impeller, and the wear ring is a protective layer around the impeller to prevent damage from wear and tear.