A winch pulls a cargo horizontally over a minor incline, but a hoist lifts a load vertically over inclines higher than 45 degrees. A horizontal winch is useful for loading and unloading trucks or containers at the back of a truck stop, for example. A vertical hoist can reach high in the air to lift heavy objects such as water tanks, wind turbines, and power lines. The operator uses a pulley system to raise and lower the load. There are two types of horizontal winches: electric and hydraulic. Electric winches use motors to create mechanical energy that is stored in some type of reservoir (such as a battery tank). These winches are useful for small loads because they do not have the lifting capacity of hydraulic winches. Hydraulic winches use oil or other fluid to create pressure that drives pistons or similar mechanisms up and down to lift weights beyond what an electric winch could handle. This type of winch is more suitable for large loads because it has greater lifting power than an electric winch. Winches can be found in many different sizes and configurations depending on the application. They are available from small hand-powered models for home use to large motorized units for industrial applications.