Renewable energy

Renewable Energy

Renewable energy (pronunciation: /rɪˈnjuːəbəl ˈɛnədʒi/) is energy that is collected from resources which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.

Etymology

The term "renewable" comes from the Old French renovare which means to "restore or renew". The term "energy" comes from the Late Latin energia which means "activity, operation", and which comes from the Greek energeia which means "activity, operation".

Related Terms

• Solar energy: The radiant light and heat from the sun that is harnessed using a range of technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis.

• Wind energy: The process by which wind is used to generate electricity. Wind turbines convert the kinetic energy in the wind into mechanical power.

• Hydropower: The use of energy in water (from its flow or fall) to generate electricity. Hydropower is produced in 150 countries, with the Asia-Pacific region generating 32 percent of global hydropower in 2010.

• Geothermal energy: Thermal energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter.

• Biomass: Organic material that comes from plants and animals, and is a renewable source of energy. Biomass contains stored energy from the sun.

• Biofuel: A fuel that is produced through contemporary processes from biomass, rather than a fuel produced by the very slow geological processes involved in the formation of fossil fuels, such as oil, coal, and natural gas.

• Tidal energy: A form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity.

• Wave energy: The transport of energy by wind waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water.

See Also

• Sustainable energy
• Energy conservation
• Energy policy
• Energy development

External links

• Medical encyclopedia article on Renewable energy
• Wikipedia's article - Renewable energy

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