7B+Hydroelectric+Power

By:Disha& Ago
 * __Hydroelectric Power__**

Every day there is lots of fossil fules used. So scientests discovered a natural reasorce called Hydroelectric Power. Hydroelectric power is number one after coal power(7B Coal Power). It is the is the making of electricity with the use of water movement.
 * __Introduction[[image:grade7isyscience/hydrodam[1].gif width="311" height="209" align="right"]]__**

__**How it works?**__ Hydroelectric Power is the making of electricity with the use of water movement. To make hydroelectricity a dam has to be build where there is a natural river or lake on a valley. Energy is stored in the water and it is used to turn generators and create electricity. Then water flows through tunnels with great pressure and that is what is called Hydroelectricity. The way hydroelectricity is made is that the dam would get in the water and create pressure so that the water can create electrical power gravitation. Energy is stored in the water and it is used to turn generators and create electricity. There are tunnels inside the dam. Through these tunnels with great pressure is used to turn turbines on. A turbine Converts the kinetic energy of falling water into mechanical energy. Turbines can spin about 90 times in one minute. The place where the turbines and generators are is called the power house. A rod connects each to turbine to a generator. When the turbines turn it makes a electro magnet to turn inside coils of wire in the generator. The spinning magnets put electrons in motion inside the wires, creating electricity. The reason why the water has a lot of pressure is because of the great height that its in the dam. The higher the water is the more energy in will make. There is a generator in the dam that sends electricity to the wires and that's how the electricity gets to house.

__**How wide spread is it?**__ In Asia countries such as China is also using alot of hydroelectric power. In Africa about,38 countries such as Mozambique, Egypt, Zambia, Nigeria, The Democratic Republic of Congo, Ghana, Zimbabwe, Cameroon, Kenya, Ethiopia, Angola, Morocco, Namibia, Cote D'ivoire, United Republic of Tanzania, Sudan, Uganda, South Africa, Malawi, Gabon, Madagascar, Reunion, Guinea, Congo, Mali, Algeria, Lesotho, Swaziland, Tunisia, Rwanda, Burundi, Central African Republic, Togo, Burkina Faso, Mauritius, Mauritania, Sao Tome and Principe use hydroelectric power as their electric source. Hydropower generates about 16 percent of the world's and 12 percent of the United States' electricity.

__**How Efficent is it?**__ To know how efficent it by the size of of the damp. So bigger damps would capture up to 90% of the available energy and smalled damps would capture about 50 % which it the least energy a hydroelectric power can produce.Some energy be allowed to escape by the damp. Hoover Dam cost about 690 million dollars in this current age and the Three Gorges Dam in China cost about 30 billion dollarsto build in 2006.

__**Benefits and Drawbacks**__

Benefits Drawbacks
 * Hydroelectricity is eco friendly no pollution or waste is produced
 * The energy source is also resuble. It is also very reliable.
 * The dam is also not expensive after it is build since not many workers are needed
 * Also water can be stored waiting to be used in peak times.
 * Building a dam takes time and
 * It is expensive
 * dam can change the environment
 * change the level of the water( flood or water level go down)
 * change in the level of water make it hard for fish to survive when the water is shallow
 * land below dam affected flow of water and is reduced.

__**Roles in the future**__ What we think is going to happen in the future about hydro electric power is that many countries will want to use it because it doesn't contain any fossil fuel and also it's eco friendly. By then all countries would have enough money to build many hydroelectric plants. Another reason, one country would want to use hydroelectric power is because once you spend a lot of money to build it, then for about 30-60 years the country won't suffer spending so much money after every 2-3 years. That is because not many workers are required to work at a hydroelectric plant every day. Also it is very easy to get hydroelectric power at homes because it's just some underground wires. One example that supports our idea is that Africa needs lots of electric city so they are using the Victoria Falls to get electric energy for the whole country. By this example this is what we thing is going to happen to hydroelectric power in the future.

__**Biblography**__ Information: [] [] [] [] [] [] [] [] [] [] [] [] [] [|Hydroelectric Power - dam, building, river, percentage, largest, hydro, system, plants, source, human, Pacific] [|http://www.waterencyclopedia.com/Ge-Hy/Hydroelectric-Power.html#ixzz1vc4XewDw] __**\**__ [|http://wiki.answers.com/Q/How_efficient_is_hydroelectric_power_generation#ixzz1vnQGgF1Z]

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