Hydroelectric power 2014
Hydroelectric power must be one of the oldest methods of producing power. No doubt, Jack the Caveman stuck some sturdy leaves on a pole and put it in a moving stream. The water would spin the pole that crushed grain to make their delicious, low-fat prehistoric bran muffins. People have used moving water to help them in their work throughout history, and modern people make great use of moving water to produce electricity.
Hydroelectricity means getting energy from flowing or falling water. A dam is built to trap water, usually in a valley where there is an existing lake. Water is allowed to flow through tunnels in the dam, to turn turbines(which look a little like an ammonite shell: a wheel with bucket-shaped blades around the rim. Water "blows" them round, and they drive generators in hydro-electric power stations). Noticed is that the dam is much thicker at the bottom then the top, because the water pressure increases how deeper you go down. Hydroelectric power stations can produce a great deal of power very cheaply.
information about the picture: reservoir: Dams create reservoirs (a large “lake” of calm water) behind them, which can be used for recreation, wildlife sanctuaries (were animals live), and sources of drinking water. Intake: water goes through here, flowing to the turbine (1). turbine: like a wheel with paddles, where water comes through so it turns around (1). Generator: is attached to the turbine, producing electricity when the turbine turns around (2).
Hydroelectric power is an extremely flexible technology to generate power. The basic principe of hydropower is that if water can be piped from a certain level to a lower level, then the resulting water pressure can be used to do work. If the water pressure is allowed to move a kind of dynamo then that movement makes power out of the energy of the water. It then can be used to drive an electricity generator, a grinding mill or some other useful things.
the energy is mostly waked up by falling water. How does it work?
Typical hydroelectric powerplant water stored in the dam. go´s down . the turbine starts spinning. power . transformer (power – machinical energy). power go´s to power lines.
intoduction: All over the world we use electricity. It´s mainly generated by oil or coal. But the problem with those sources is that it will run out in about 50 years. And also, when we burn fossils, like oil or coal, carbon dioxide is released into the air. That is one of the causes of global warming. That´s why scientists are looking for other energy sources. Our group is going to talk about hydroelectic power. Hydroelectricity means getting energy from flowing or falling water. We´re going to give some main information like: - how it works - where you can find ´plants´ (factory´s)? - can it be used in the Netherlands/Spain? - advantages + disadvantages