Warm air and cool air mix together and make wind. It moves a wind turbine and it makes electricity. Some people think wind turbines are noisy and scare animals. If they were none of them then we would have no electricity. Lots of wind turbines are put together and then that’s called a wind farm. Non- polluting can be a predictable force. One wind turbine can power over 200 homes. That’s why there are not very many about. Some people keep them at their houses like this one in the photo.
Water comes above a big water wheel. It goes around and the water goes in to a stream. Well they are supposed to go around. It has to have water at the top so it work wheels. This water wheel is the Quendale water wheel in Shetland.
When people burn coal or wood the energy is used up. Other types of energy you can use again and again. Water is one of those energy. The biggest hydroelectric power stations are The Three Gorges Complex on the Chang-Jing River in China. The energy in water can be converted to electrical energy by forcing the water to flow through a turbine.