What is the basic function of fluid power?

• A. Store energy
• B. Measure pressure
• C. Convert to heat
• D. Generate force and motion

Answer: (D)

Fluid power uses pressurized fluid to do work, and its basic function is to generate force and motion by acting on an actuator such as a piston or hydraulic motor. The force produced equals pressure times area, and the resulting movement provides the work needed to lift, push, pull, or rotate loads. Valves regulate direction, speed, and magnitude of that motion, shaping how the system performs. Energy storage devices like accumulators can hold pressure for peak or smoothing needs, but that supports the work being done rather than defining the fundamental purpose. Measuring pressure or converting energy into heat are a sensing or loss/inefficiency aspects, respectively. So the core role is to convert fluid energy into mechanical force and movement.