Which statement best describes the basic function of fluid power in mechanical systems?

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

Answer: (D)

Fluid power uses pressurized fluid to do mechanical work. The pressure pushes on a piston or motor, creating a force that, when guided by valves, produces controlled motion in cylinders or rotary actuators. This conversion of fluid energy into mechanical force and movement is the essence of fluid power. While energy can be stored in accumulators or pressure can be measured with sensors, those aren’t the primary function, and heat generation is simply a byproduct of inefficiency, not the purpose.