Industrial power is run by hydraulic power or fluid power. Hydraulic power units transmit power by using the controlled circulation of of pressurized fluids, like oil, to a motor that converts it into mechanical power that will support a work load. The power units create a large amount of power, which in turn drives the hydraulics to create a massive amount of pressure into one small area.
Hydraulic power units are used everywhere. Construction equipment like back hoes, skid steers, and dump trucks all have hydraulics on them to lift and move loads. Marine equipment, like the lifts that lift a boat out of the water or on boats with large nets that have to be lifted out of the water as well. The military applications for hydraulic power are virtually limitless. Automotive shops use hydraulic lifts to lift the vehicle into the air so that the mechanic can work on them easier and NASA uses them to lift and move the rockets and space shuttles that we send into outer space.
Farm equipment have power units as well as amusement parks rides, garbage trucks, oil rigs, and even airplanes use them to move their flaps and wheels. There are power units running almost every hydraulic powered equipment in the world. Without power units, many of the things we do today would be virtually impossible, or at least they would take much longer to do.
Hydraulic power units save time and energy, so we can do things in less time and with a minimum of effort. The engine and transmission in your car is a power unit. The motor drives the hydraulic transmission that turns the wheels and makes the car move forward. Hydraulic power units come in many sizes, and can be found in just about every part of your life, including your home. Garbage compactors used in household kitchens are also hydraulic power units.