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What is a watt?

What is a watt?

The  watt  (symbol:  W)  is the power unit of the International System of Units. Its value indicates the amount of energy in joules that is converted, used or dissipated in one second. 

One watt is equivalent to 1 joule per second (1 J / s).

It is a derived unit that takes its name from the Scottish engineer, inventor and builder of instruments James Watt, for his contribution to the development of the steam engine, which was one of the triggers for the start of the Industrial Revolution.

The watt was adopted by the Second Congress of the British Association for the Advancement of Science in 1889. This adoption…

Last review: March 25, 2020

Solar energy, a renewable energy source

Solar energy, a renewable energy source

The term solar energy refers to the use of energy that comes from the Sun. It is a type of renewable energy. The energy contained in the Sun is so abundant that it is considered inexhaustible. The Sun has been emitting solar radiation for 5 billion years and it is calculated that it has not yet reached 50% of its existence.

Solar energy, in addition to being inexhaustible, is abundant: the amount of energy that the Sun pours daily on Earth is ten thousand times greater than that consumed daily throughout the planet. The received…

Last review: March 23, 2020

Fahrenheit degree

Fahrenheit degree

The degree Fahrenheit (° F) is a unit of temperature proposed by Gabriel Fahrenheit in 1724. The degree Fahrenheit is not a unit of the International System of Units.

On the Fahrenheit scale, the state change temperatures of the water are as follows:

  • Melting point of water is 32 degrees F.
  • Boiling point of water is 212 degrees F.
  • A difference of 1.8ºF is equivalent to that of 1 degree Celsius. Fahrenheit set the temperature to zero (0 ° F), to the freezing point of a 50% mixture of salt (ammonium chloride) and ice, and at 96 ° F, he took the blood temperature (he used that of the horses ).

    The figure 96 may seem like a strange…

    Last review: March 19, 2020

    What is the temperature?

    What is the temperature?

    Temperature is the thermodynamic magnitude that shows the thermal energy of one body in relation to that of another. This thermodynamic property only describes a macroscopic state.

    This property is related to the physiological sensation of cold and heat. This sensation is generated when there is an exchange of thermal energy between the human body and other bodies or, simply, the environment that surrounds it. However, it must be considered that within the human perception there is the concept of thermal sensation that alters this perception due to other external factors.

    From the physical point of view, the temperature of a substance can be defined, according to molecular theory,…

    Last review: March 17, 2020

    Thermal sensation

    Thermal sensation

    Thermal sensation is a measure of the sensation of cold or heat that humans find in cold air with a lot of wind or hot air with the sun, without wind and high humidity. This part is about the cold wind, the additional feeling of cold due to the wind.

    The phenomenon of thermal sensation, or cold wind, is, therefore, a phenomenon in which you feel much colder with the wind than without the wind. The colder it is and the faster the wind blows, the colder it feels. We can express that heat loss in a kind of emotional value of temperature.

    At a feeling temperature below -10 degrees Celsius, symptoms of hypothermia may appear after several hours. Sensory temperatures below -15 degrees…

    Last review: March 16, 2020



    Photosynthesis is a chemical process that converts carbon dioxide into organic compounds, especially using solar energy. This chlorophyll function converts inorganic matter into organic matter thanks to the energy provided by light.

    Photosynthesis occurs in plants, algae, and some groups of bacteria, but not in archaea. Photosynthetic organisms are called "photoautotrophs", but not all organisms that use light as an energy source perform photosynthesis, since "photoheterotrophs" use organic compounds, and not carbon dioxide, as a carbon source.

    In plants, algae, and cyanobacteria, photosynthesis uses carbon dioxide and water, releasing oxygen as a waste product. photosynthesis…

    Last review: March 15, 2020

    Isolated photovoltaic installations

    Isolated photovoltaic installations

    Autonomous photovoltaic installations are those installations that are isolated from the electricity grid. All the electrical energy generated by solar panels is consumed directly.

    These types of photovoltaic installations are designed for cases where the cost of maintenance and installation of power lines is not profitable. For example, this would be the case of mountain shelter.

    What applications do autonomous photovoltaic installations have?

    The main applications of isolated systems are:

    • Electrification of homes and buildings, mainly for lighting and low power appliances.
    • Street lighting.
    • Agricultural and livestock applications.
    • Last review: March 11, 2020

    Solar energy and home automation systems

    Solar energy and home automation systems

    Installing solar panels in a house can provide a great economic saving, but also produces a decrease in pollution. While it is true that self-consumption is not yet present, the installation of solar panels to reduce the electricity consumption of the Spanish Electricity Network itself.

    Another way to save energy is to use home automation systems , which allow a much more efficient use of different sections of a home, including solar panels.

    Home automation and electricity savings

    It is clear that reducing spending on electricity is a concern for many people. While it is true that many do so in view of economic savings, the truth is that more and more…

    Last review: March 6, 2020

    What is a heliostat?

    What is a heliostat?

    A heliostat is a device that basically consists of an animated mirror of a certain rotational movement and that serves to direct the rays of the Sun in a certain direction, despite the movement of the Earth with respect to the Sun.

    In the past, in many optical experiments it was necessary to pass a beam of sunlight reflected by a mirror through a series of instruments carefully installed one after another on a table or horizontal bench. But the Sun has an apparent continuous movement, which describes during its visible daily circulation around the axis of the world one of the small circles of the celestial sphere.

    In the days of the spring and autumn equinox, this circle coincides…

    Last review: March 3, 2020

    William John Macquorn Rankine

    William John Macquorn Rankine

    William John Macquorn Rankine (Edinburgh, July 5, 1820 - Glasgow, December 24, 1872) was a Scottish engineer and physicist. He had very different interests; In his youth he was interested in botany, music theory and number theory and in his last years in mathematics and technology.

    Together with Rudolf Clausius and William Thomson, he is among the founders of thermodynamics. He also developed the theory behind the steam engine, introduced concepts such as kinetic and potential energy, and investigated shock waves and metal fatigue. A temperature scale is named after William Rankine, known as the Rankine scale.

    Life of William John Macquorn Rankine

    Rankine was the son…

    Last review: February 26, 2020

    Solar energy and self-consumption

    Solar energy and self-consumption

    In the current struggle at the domestic level in favor of the use of renewable energy, only one type of energy allows a home to generate all the electricity it consumes (self-consumption), and it is solar energy.

     Although, at the theoretical level, wind energy could also allow self-consumption, the truth is that domestic systems are still underdeveloped.

    Photovoltaic Solar Energy

     This type of energy consists in the transformation of the sun's radiation into electricity, by means of photovoltaic cells . These types of cells are an electrical device capable of transforming the energy of solar radiation that affects it into electricity, by means…

    Last review: February 21, 2020