Today in this article, we wanted to give you a scientific review of the energy subject. If you wonder the answer of the “What is energy?” question, our article awaits you below:
Well, let’s ask together: what is energy? Energy is the ability to do mechanical work, to give off heat or to emit light.
a joule (1y)
The energy is a state variable and in closed systems a conserved quantity.
Energy is vital. They need people, animals and plants for their development. Technical devices such as radios, refrigerators, televisions or computers need energy to operate. Without energy, no train would travel and no plane would fly. Nevertheless, you can not see, feel or touch energy most of the time. But you can recognize them by their effects. In general, in physics, the physical quantity of energy is:
Energy is the ability to do mechanical work, to give off heat or to emit light.
a joule (1y)
The unit of energy is named after the English physicist JAMES PRESCOTT JOULE (1818-1889).
Multiples of the unit a joule (1 y) are a kilojoule (1 kJ), a megajoule (1 MJ) and a gigajoule (1 GJ):
1 kJ = 1000 J
1 MJ = 1 000 kJ = 1 000 000 J
1 GJ = 1 000 MJ = 1 000 000 kJ = 1 000 000 000 J
In addition to the unit 1 J, further units are used for the energy, sometimes only in special areas of the energy industry:
one Newton meter (1 Nm) 1 Nm = 1J
one watt second (1 Ws) 1 Ws = 1 J
a coal unit
1 SKE = 29.3 MJ
(This is the energy content of 1 kg of hard coal, which is released in complete combustion.)
a crude oil unit
1 ROE = 41.9 MJ
(This is the energy content of 1 liter of crude oil that will be released in complete combustion.)
Energy as State and Conservation Quantity
The physical quantity energy characterizes the state of a body, an electric field or a magnetic field. In physics, such a quantity is called a state variable, in contrast to a process variable that characterizes a process.
For a closed area or – as physics says – for a closed system, the total energy is always preserved. The energy is therefore also a conservation quantity, for which a conservation law – the law of conservation of energy – applies. Our what is energy? themed article goes ahead from below.
Energy Forms and Energy Sources
Energy can occur in different forms, eg. Example in the form of electrical, thermal, mechanical or chemical energy or energy of electrical and magnetic fields. More detailed information can be found under the keyword energy forms. Body or space areas that possess energy are called energy sources or energy sources. More detailed information is given under the keyword “energy sources”. What is energy article details below.
Energy in Transition
In a closed area (closed system), the total energy remains the same, but:
1- Energy can be transmitted (transported) from one body to another body,
2- Energy can be transformed from a shape to other forms
3- Energy can be canceled, d. H. be transformed into forms that are useless for humans;
4- Energy can be stored.
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