What is the primary function of a hydraulic jack?

The primary function of a hydraulic jack is to lift heavy objects off the ground. Hydraulic jacks operate based on Pascal's principle, which states that pressure applied to a confined fluid is transmitted undiminished throughout the fluid. This allows the hydraulic jack to amplify force, making it possible to lift heavy loads with relatively little effort. The mechanism involves a small piston that requires less force to operate, which in turn raises a larger piston connected to the load. This makes hydraulic jacks invaluable in various applications, including automotive repair, construction, and manufacturing, where lifting heavy machinery, vehicles, or structural components is necessary.

The other options represent functions that do not align with the design and purpose of a hydraulic jack. For example, drilling and cutting require entirely different tools designed for penetrating or shaping materials, while providing electrical power is outside the scope of mechanical lifting tools altogether.