Which statement accurately describes the action of a hydraulic cylinder?

The action of a hydraulic cylinder is accurately described by the principle of Pascal's law, which states that when pressure is applied to a confined fluid, the pressure change occurs throughout the fluid equally in all directions. This means that the hydraulic fluid within the cylinder transmits force effectively, allowing the cylinder to perform work by moving a load with significant force relative to its size.

This principle is fundamental to the function of hydraulic cylinders, which utilize pressurized fluids to create linear motion. The design ensures that even a small amount of force applied to the fluid can result in a much larger force at the output end, making hydraulic cylinders very effective for various applications in machinery and systems.

In contrast, other choices incorrectly characterize hydraulic cylinders. For example, stating that they are only used in static applications overlooks their dynamic capabilities in driving machinery and equipment. Suggesting that they require electrical power to function is misleading, as hydraulic cylinders operate based on fluid pressure rather than electrical energy. Finally, the notion that they create a vacuum to operate contradicts their reliance on pressurized fluid to generate movement and force.