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A hydroelectric power station is a set of hydraulic engineering works together with a series of suitable machines. The objective of a hydroelectric power station is to produce electricity from the potential energy of moving water bodies.
This type of power plants take advantage of the potential energy of the water to generate electrical energy.
The energy produced by hydroelectric plants must be classified in all respects as renewable energy. Thanks to the water cycle, this resource can be reused endlessly for the same purpose without undergoing a purification process. The concept of renewability is subordinated to the constancy of the annual volume of total entries.
Last review: July 1, 2020
The Stirling engine is a type of heat engine. Its operation is based on the expansion and contraction of a gas. This gas flow cyclically from a cold focus where it contracts to a hot area where it expands.
The Stirling engine was invented by Robert Stirling in 1816. He is considered one of the fathers of hot air engines. The goal was to get a less dangerous engine than the steam engine.
Originally, the Stirling engine was conceived as an industrial main engine to compete with the steam engine. In practice, for more than a century it was only used for domestic applications and for low-power motors.
Development is still…
Last review: June 29, 2020
The ozone layer is the part of the Earth's atmosphere that contains relatively high concentrations of ozone (O3). An ozone molecule is made up of three oxygen atoms. The oxygen molecules we breathe are made up of just two oxygen atoms.
Absorbs 97 to 99% of solar radiation, which is harmful to life on Earth. It is mainly found in the lower part of the stratosphere at an altitude of approximately 13 km to 40 km, but its thickness varies according to the season and the geographical area.
Ozone occurs both in the Earth's upper atmosphere and at ground level. The ozone molecule is harmful to air quality. EPA regulations help states reduce ozone levels in outdoor air.Hole…
Last review: June 28, 2020
Isothermal process is a thermodynamic transformation at constant temperature. That is a variation of the state of a physical system during which the temperature of the system remains constant.
Since the internal energy of an ideal gas depends only on temperature and, in an isothermal process, remains constant in expansion, the heat taken from the focus is equal to the work done by the gas: Q = W. According to the first law of thermodynamics
Thermostats are devices that can maintain a constant temperature value in this kind of thermodynamic process.
Boyle’s law describes the isothermal transformation of a perfect gas. “The pressure exerted by a chemical force…
Last review: June 23, 2020
An electrolyte is a substance that dissociates into ions when it dissolves or melts, making it electrically conductive. It is a material that dissolves in water to produce a solution that conducts an electric current.
This term is used in various fields of science and technology, with related but not identical meanings between the various disciplines.
Electrical engineering: the medium in batteries, accumulators, or capacitors.
Chemistry: Substances that fully or partially divide into ions during dissolution or fusion and therefore conduct electrical current.
Physiology: Simple ions that dissolve in blood or intracellular tissue.…
Last review: June 21, 2020
An electric generator is a device designed to produce electricity from other types of energy. The most common is the one that transforms mechanical energy into electrical energy. Sometimes it is also called a generator set.
An electric generator is an instrument that converts mechanical energy into electrical energy. The operating principle of it is based on the principle of electromagnetic induction.
The electric generators can be used for:
Generate electricity in order to transmit and distribute it over power lines to domestic.
As an emergency backup power or in order to generate electricity permanently. They work as standby generators.…
Last review: June 19, 2020
The term solar energy refers to the use of energy from the Sun. By installing solar panels and other systems, it can be used to obtain thermal energy or electricity generation.
It is a renewable energy source. The energy of the Sun is considered inexhaustible on a human scale. Therefore, it is an alternative to other types of non-renewable energy such as fossil fuels or nuclear energy.
Solar energy received on Earth receives is ten thousand times greater than the one that is consumed per day. However, it is distributed…
Last review: June 18, 2020
A thermodynamic system is a part of the physical universe with a specific limit for observation. This limit can be defined by real or imaginary walls.
A system contains what is called a study object. A study object is a substance with a large number of molecules or atoms. This object is made up of a geometric volume of macroscopic dimensions subjected to controlled experimental conditions.
A thermodynamic system can undergo internal transformations and exchange energy and/or matter with the external environment.Definition of thermodynamic system
A thermodynamic system is defined as a quantity of matter or a region in space on which attention is focused on the…
Last review: June 17, 2020
Fossil fuels are a non-renewable energy source. This resource comes from decomposed animals and plants. It is a natural resource that takes millions of years to regenerate.
Fossil fuels are currently the most widely used energy source in the world. The main utility is to generate electricity. They are also used to generate mechanical energy (automobiles, heat engines, etc.).
The carbon content in these minerals is high. In consequence, the combustion generates greenhouse gases such as carbon dioxide. The greenhouse effect is one of the main causes of climate change. Not letting heat escape into space accentuates the global warming of the planet.
The main uses of fossil…
Last review: June 16, 2020
Photovoltaic and solar thermal are two renewable energy sources. Both systems are based on the use of solar energy. Solar thermal uses heat and photovoltaic power systems to generate electricity.
Although solar PV and solar thermal are both systems powered by solar radiation, there are several differences:
Type of energy obtained: PV generates only electricity. Thermal solar stations convert sunlight into heat. This heat can be used directly, but solar thermal power plants use it to obtain electrical energy.
Different cost of solar panels. Photovoltaic panels are more expensive than solar collectors.
Energy storage techniques. Photovoltaic…
Last review: June 14, 2020
Photovoltaic is an adjective to identify everything that has to do with photovoltaic energy and the photovoltaic effect, more specifically. This concept of solar energy refers to the generation of electricity through sunlight.
The meaning of photovoltaic comes from the composition of photon and volt.
A photon is the particle that carries all forms of electromagnetic radiation, including visible light. On the other hand, a volt is the unit of electric current. In this way, it is easy to deduce the relationship between visible light or solar radiation with the generation of electrical energy or electricity.
We refer to the photovoltaic effect in everything related to obtaining…
Last review: June 11, 2020