Energy sources: a summary of the science

energy resources

L ‘Energy It is the ability to do work. You need to light cities and road networks, to keep homes warm, and to power appliances and technology industries Energy. The raw material is the sources of energy, this is what nature has made available to us and we can use it directly in the natural state, sources primaryor we must convert in order to use it, the secondary sources.

Energy Sources: Summary –
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Primary sources and secondary sources

The primary sources are oil, coal, natural gas, river and lake water, sun, wind, geothermal heat, nuclear fuels such as uranium, wave power, and the sea. Secondary sources are, for example, products derived from petroleum processing, such as fuel oil.

Exhausted and renewable resources

The energy sources are also distinguished according to the duration of the sources in:

  • exhausted resourcesLike the Fossil fuels and theuranium;
  • Renewable energyLike The water cycle, biomassL’wind origin, L ‘The origin of the tides and the Sun.

By economic importance and meeting energy needs, they are divided into:

  • sources the basicLike the Fossil fuelsThe thermoelectric;
  • Supplementary Resources Like the hydroelectricity and the nuclear;
  • alternative sources, Like the PVAnd wind turbinesAnd GeothermalAnd Biomass or biogas Based on solar power plants;

Pros and cons of energy sources

Energy sources located on ground You have strengths and weaknesses:

  • the sunSolar energy is free, inexhaustible and scattered all over the world. It does not pollute and does not produce residue. On the other hand, the sun is a non-continuous source, it disappears at night and when it is cloudy. Factories cost a lot, and to produce good amounts of electricity it is necessary to cover large areas with solar panels.
  • Coal, oil and gas: They are the most common sources, they are easy to use, produce a lot of energy and can be transported, stored and used when needed. They have high caloric values. It is not renewable. Its price is variable and varies according to its availability in the market and the international political situation. When burned, they produce sulfur dioxide, dust, nitrogen oxides and carbon dioxide: they must therefore be used with complex systems to prevent them from becoming sources of atmospheric pollution.
  • Waterfall: The energy of water is abundant and clean. During the night, when the demand for energy is lower, water at some specialized stations can be pumped up, and then reused when the energy is most needed. It is only available in places where there are natural or man-made rivers and reservoirs. Artificial ponds can have a significant environmental impact, modifying the hydrogeological balance and ecosystems.
  • Geothermal: It is an inexhaustible and low-pollution source, very suitable for heat energy production. Only some areas allow the use of geothermal energy.
  • winds: It does not run out, does not produce residues, and does not pollute. Only some areas are suitable for the use of wind energy, which requires large surfaces, often on the slopes of mountains; Factory construction costs remain high.
  • Biomass: They are renewable sources. In the case of organic waste or agricultural waste, they use “recycled” energy. They can only meet the minimum energy needs. It is suitable for domestic uses.
  • uranium: Produces clean energy because it does not involve greenhouse gas emissions. The availability of uranium is very large. It allows the development of large power plants that produce energy at low cost.

hydroelectric power stations

A hydroelectric power station converts the hydraulic energy of a watercourse, whether natural or artificial, into electrical energy. In general, the functional scheme includes the septum, one dam or the keel, which blocks the watercourse creating a reservoir that can be a tank, or a basin, in which a roughly constant level of water is kept. Through rounding works, i.e. the passage from drinking water intake points to reservoirs, canals and derivation galleries, the water is transferred to loading tanks and by coercive behaviorat turbinesvia inlet valves Safety devices and water dispensers to regulate flow rate according to energy demand. The water powers the turbines and exits and ends up in the drain channel through which it is returned to the river.

Transfer directly to turbine being installed BornIt is a rotating electrical machine capable of converting the mechanical energy it receives turbine. The electrical energy obtained must be converted in order to be transmitted over a large distance. Therefore, before it is transferred to the transmission lines, it passes through the transformer reducing the current, while raising the voltage. Once the electricity reaches the place of use, the electricity again passes through a transformer, this time raising the current and lowering the voltage to make it suitable for home use.

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