renewable energy definition
Renewable energies (Renewable energies) are sources of energy whose natural renewal is fast enough so that they can be considered inexhaustible on the scale of human time. They come from natural cyclical or constant phenomena induced by the stars (Sun especially for heat and light), but also the Moon (tide) and the Earth (geothermal). Its renewability depends, on the one hand, on the rate at which the source is consumed and on the other hand on the rate at which it regenerates.
The term "renewable energy" is the short and common form of the terms "renewable energy sources" or "renewable energies" that are more physically correct.
The share of renewable energies in the final global energy consumption in 2014 was estimated at 19.2%, of which 14% was biomass, and their share in electricity production at the end of 2015 was estimated at 23.7%: 16.6% hydro, 3.7% wind, 2.0% biomass, 1.2% photovoltaic and 0.4% various (geothermal, solar thermodynamic, marine energies).
The Sun is the main source of the different forms of renewable energies: its radiation is the vector of transport of the energy usable (directly or indirectly) during the photosynthesis, or during the cycle of the water (which allows hydroelectricity ) And the wave energy (wave energy), the temperature difference between the surface waters and the deep ocean waters (thermal energy of the seas) or the ionic diffusion caused by the arrival of fresh water in the water Of sea (osmotic energy). This solar energy combined with the rotation of the Earth is at the origin of winds (wind energy) and marine currents (hydro-electric energy).
The Earth's internal heat (geothermal energy) is considered to be a form of renewable energy, and the Earth-Moon system generates the tides of the oceans and seas allowing the development of tidal energy.
Solar energy and the internal heat of the Earth come from nuclear reactions (nuclear fusion in the case of the Sun, nuclear fission in the internal heat of the Earth). Only tidal energy does not arise from nuclear activity but from gravitation (Earth-Moon couple). Gravitational energy is not a form of energy per se, but simply a vector of a form of energy present elsewhere. Solar radiation induces a cycle of water that we take advantage of via the falls and streams.
Fossil fuels or minerals (fissile materials) are not renewable sources of energy, since resources are consumed at a rate much higher than the speed at which they are naturally created or available.
The term "renewable energy" is the short and common form of the terms "renewable energy sources" or "renewable energies" that are more physically correct.
The share of renewable energies in the final global energy consumption in 2014 was estimated at 19.2%, of which 14% was biomass, and their share in electricity production at the end of 2015 was estimated at 23.7%: 16.6% hydro, 3.7% wind, 2.0% biomass, 1.2% photovoltaic and 0.4% various (geothermal, solar thermodynamic, marine energies).
The Sun is the main source of the different forms of renewable energies: its radiation is the vector of transport of the energy usable (directly or indirectly) during the photosynthesis, or during the cycle of the water (which allows hydroelectricity ) And the wave energy (wave energy), the temperature difference between the surface waters and the deep ocean waters (thermal energy of the seas) or the ionic diffusion caused by the arrival of fresh water in the water Of sea (osmotic energy). This solar energy combined with the rotation of the Earth is at the origin of winds (wind energy) and marine currents (hydro-electric energy).
The Earth's internal heat (geothermal energy) is considered to be a form of renewable energy, and the Earth-Moon system generates the tides of the oceans and seas allowing the development of tidal energy.
Solar energy and the internal heat of the Earth come from nuclear reactions (nuclear fusion in the case of the Sun, nuclear fission in the internal heat of the Earth). Only tidal energy does not arise from nuclear activity but from gravitation (Earth-Moon couple). Gravitational energy is not a form of energy per se, but simply a vector of a form of energy present elsewhere. Solar radiation induces a cycle of water that we take advantage of via the falls and streams.
Fossil fuels or minerals (fissile materials) are not renewable sources of energy, since resources are consumed at a rate much higher than the speed at which they are naturally created or available.
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