A hydro-electric power dam uses the concept of kinetic energy in fast-flowing water to produce electricity. Take a look at how a basic hydro-electric power dam is set up in the diagram below.

1. Water from a stream or river is held up (blocked) by the sluice gate. Holding up more water increases potential energy and gravitational energy.

2. The gates are then opened. Water rushes down through the gate and into the tubes. There is immense kinetic energy in the very fast flowing water because of the high pressure it has.

3. Kinetic energy in the fast-flowing water turns shafts (blades) connected to the end of the tubes. More fast-flowing water means more blades can be turned even faster.

4. The spinning blades or shafts are connected to a generator that generates electricity. The generator is connected to a transformer which supplies our homes with electricity.