Water power engine
A water power engine includes prime movers driven by water and which may be classified under three categories: Water pressure motors, having a piston and cylinder with inlet and outlet valves: their action is that analogous of a steam- or gas-engine with water as the working fluid - see water engine Water wheels Turbines, deriving their energy from high velocity jet of jets (the impulse machine), or from water supplied under pressure and passing through the vanes of a runner which is thereby caused to rotate (the reaction type) Hydro power is generated when the natural force from the water's current moves a device (fan, propeller, wheel) that is pushed by the force of the water. Ordinary water weighs 8.36 lbs per gallon (1 kg per liter).