Renewable energies

Renewable energiesRenewable energies

Plan of this presentation Plan of this presentation

Définition of the renwable energy Définition of the renwable energy

Wind energyWind energy

Géothermal energyGéothermal energy

Hydropower energy Hydropower energy

Solar energy Solar energy

Biomass energyBiomass energy

Définition :Définition :

Renewable energy is energy generated from natural resources such as Biomass, hydropower, Geothermal, Wind, Solar which are renewable (naturally replenished). In . In 2006, about 18% of global final 2006, about 18% of global final energy consumption came from energy consumption came from renewables and it’s can be renewables and it’s can be replenished in a short period of time replenished in a short period of time

Wind energy :Wind energy :

Energy from Moving AirEnergy from Moving Air Wind is simply air in motion. It is Wind is simply air in motion. It is

caused by the uneven heating of the caused by the uneven heating of the Earth's surface by the sun. Because Earth's surface by the sun. Because the Earth's surface is made of very the Earth's surface is made of very different types of land and water, it different types of land and water, it absorbs the sun's heat at different absorbs the sun's heat at different rates. Today, wind energy is mainly rates. Today, wind energy is mainly used to generate electricity. Wind is a used to generate electricity. Wind is a renewable energy source because the renewable energy source because the wind will blow as long as the sun wind will blow as long as the sun shines.shines.

Geothermal energy :Geothermal energy :

The word geothermal comes from The word geothermal comes from the Greek words the Greek words geogeo (earth) and (earth) and thermetherme (heat). So, geothermal (heat). So, geothermal energy is heat from within the Earth. energy is heat from within the Earth. We can recover this heat as steam We can recover this heat as steam or hot water and use it to heat or hot water and use it to heat buildings or generate electricity. buildings or generate electricity.

Geothermal energy is a renewable Geothermal energy is a renewable energy source because the heat is energy source because the heat is continuously produced inside the continuously produced inside the Earth.Earth.

Hydropower energy :Hydropower energy :

Energy From Moving WaterEnergy From Moving Water Hydropower is the renewable energy Hydropower is the renewable energy

source that produces the most source that produces the most electricity in the United States. It electricity in the United States. It accounted for 6% of total U.S. accounted for 6% of total U.S. electricity generation and 67% of electricity generation and 67% of generation from renewables in 2008.generation from renewables in 2008.

Solar energy : Solar energy : Energy from the SunEnergy from the Sun The sun has produced energy for billions The sun has produced energy for billions

of years.  Solar energy is the sun’s rays of years.  Solar energy is the sun’s rays (solar radiation) that reach the Earth. This (solar radiation) that reach the Earth. This energy can be converted into other forms energy can be converted into other forms of energy, such as heat and electricity. In of energy, such as heat and electricity. In the 1830s, the British astronomer John the 1830s, the British astronomer John Herschel famously used a solar thermal Herschel famously used a solar thermal collector box (a device that absorbs collector box (a device that absorbs sunlight to collect heat) to cook food sunlight to collect heat) to cook food during an expedition to Africa. Today, during an expedition to Africa. Today, people use the sun's energy for lots of people use the sun's energy for lots of things. things.

Biomass energy :Biomass energy :

Biomass is organic material made Biomass is organic material made from plants and animals. Biomass from plants and animals. Biomass contains stored energy from the contains stored energy from the sun. Plants absorb the sun's energy sun. Plants absorb the sun's energy in a proches called photosynthesis. in a proches called photosynthesis. The chemical energy in plants gets The chemical energy in plants gets passed on to animals and people passed on to animals and people that eat them. that eat them.

Biomass is a renewable energy Biomass is a renewable energy source because we can always grow source because we can always grow more trees and crops, and waste will more trees and crops, and waste will always exist. always exist.