What do hydraulic systems use to transmit power?

Hydraulic systems utilize a pressurized fluid to transmit power, which is the foundational principle behind their operation. In these systems, a liquid (typically oil) is contained in a closed system and is pressurized using a pump. This pressurized fluid can then be directed through hydraulic lines to actuate various mechanisms such as cylinders or motors, providing an efficient means of transmitting power over distance without substantial loss.

The use of a pressurized fluid allows hydraulic systems to generate significant force and torque, making them ideal for heavy machinery and industrial applications. Additionally, the fluid can be easily controlled, allowing for precise movements and adjustments in machinery. Overall, the reliance on pressurized fluid as the power-transmitting medium is what characterizes hydraulic systems, differentiating them from systems that rely on mechanical components or other forms of power transmission.