Which statement accurately describes the relationship between pumps and pressure?

• A. Flow
• B. Pressure
• C. Volume
• D. Temperature

Answer: (A)

Pumps are defined by the flow they deliver. They move fluid, creating a flow rate through the system. The pressure that appears in the circuit is then a result of the fluid encountering resistance in pipes, valves, and components—the load on the pump. In other words, the pump sets how much fluid can move per unit time, while the system’s resistance determines the pressure that builds up. At a given pump speed, higher resistance raises pressure but reduces flow, and at low resistance you get more flow with less pressure. Volume and temperature aren’t the defining relationship here.