Renewable energy is energy that does not run out, which can be used to generate electricity or for transports.
Some sources of renewable energy are the sun, rain, wind, ocean waves, the heat of the earth, biomass.
Hydro power:
Hydro is the production of electricity through hydroelectric plants, which are associated with dams. Centrals, use the energy generated by water passing from a higher level to a level lower spins the turbines and generators, generating electricity.
The production of hydro-electricity is fairly efficient and relatively non-polluting.
Currently, approximately 30% of the electricity consumed in Portugal was produced by hydropower.
http://www.explicatorium.com/images/Krasnoyarsk_hydroelectric_station.jpg
Wind power:
Wind energy is to harness the wind to produce electricity. You can build wind farms in areas where wind is abundant. Wind farms consist of wind turbines that are a few towers with propellers that rotate with the wind. When the blades rotate, move a generator, which in turn produces electricity.
http://www.solarnavigator.net/images/wind_turbine_aalborg.jpgBiomass energy:
Biomass is the natural waste and waste of human activity. Biomass can be used directly as fuel, or by its degradation to produce a combustible gas, called biogas. The heat produced can be used to heating or for steam production. This steam drives a turbine that will produce electricity.
http://www.akenergyauthority.org/images/photos/AEEEBiomass.jpg
Photovoltaic solar energy:
Solar energy is to harness the radiation from the sun through photovoltaic cells or by heating water.
Photovoltaic cells, when they receive radiation from the sun, generating electricity. This electricity can be used for electrical equipment, or directly to the mains.
In solar water heaters, they're mirrors which concentrate the radiation, which will heat the water. Is generated steam to spin turbines, and thus produces electricity.
http://www.ciclosystem.com/imgprodutos/paineis_fotovoltaicos.jpg
Geothermal energy:
Geothermal energy is to harness the heat from the earth. Through a turbine-driven steam to produce electricity. The water vapor comes from the high temperatures inside the Earth. This type of energy can only be used in areas where there is volcanic activity, where there are rocks or water at high temperature.
http://www.greenenergywebsites.com/photos/geothermal_greenenergywebsites.jpg
I really think that renewable energies should be more exploited, because if we can take advantage from them, we can save our planet. We can save many, many different kinds of species, we can save our children. If you think about it, if humans were polluting some centuries before they started doing it, and they didn't do nothing about it, the human race could be extinguished.
ResponderEliminarSo, don't do to the others what you don't want them to do to yourself!