What is joule?

What Does joule Mean

The term joule , or July , is used in the field of physics to refer to a unit of work that is part of the international system. One joule is equivalent to the work produced by a constant force of one newton whose point of application travels one meter in the same direction as the force .

To understand what a joule is, therefore, it is important to first know what various concepts consist of. In physics, work is the product of a force and the distance traveled by its point of application. In other words: when a force modifies the state of motion of a body, it performs work.
A newton , meanwhile, is a unit of force. One newton is equivalent to the force that manages to produce an acceleration of 1 meter / second every second when applied to a body with one kilogram of mass.

Combining the concepts of work , force and newton , then we come to the idea of joule, symbol J . The formal definition states that a 1-newton force with an application point moving one meter in the same direction as the force does a 1-joule amount of work .
It is essential to bear in mind that, for theoretical purposes, the various resistances are not considered. For this reason, when measuring the work of the force, the influence of air friction , for example, is not analyzed .
Notably, joule comes from James Prescott Joule . This English physicist, born in 1818 and died in 1889 , made great discoveries related to energy , electricity, magnetism and thermodynamics.
When solving problems, it is very important to know the equivalences of the different units used, since many times the possibility of solving an unknown and finding out its value depends on this resource . In the case of the joule, the list is quite extensive. We can say, therefore, that one joule is equivalent to: one newton per meter; one watt per second; 6.2415 times 10 to the 18th electron volt; one coulomb per volt; 0.00987 atmosphere per liter; one pascal per cubic meter; 0.238902957 calorie.
As we can see, there are many units that are related to the joule, and some are not so common outside the realm of physics. The electronvolt , for example, is the unit of energy that serves to represent a kinetic-type energetic variation that an electron goes through when it moves between two points of different potentials (which are usually designated by Va and Vb), provided that the difference between the two be one volt.

The coulomb , on the other hand, is a unit that derives from the international system and is used to measure the physical quantity known as electrical charge or quantity of electricity . His name also derives from a physicist, this case of the French Charles-Augustin de Coulomb . The definition of the coulomb is as follows: it is the amount of charge that a current of one ampere carries in one second.
These equivalences are measured taking into account 1 joule, but there are also others that are called inverses , in which the value 1 is held by the other units . Let's look at some of them below: one watt per hour equals 3600 joules; a kilowatt hour is equal to 3.6 times 10 to the 6 joules; one calorie equals 4,187 joules; a kilocalorie, since it is a thousand calories, is equal to 4187 joules.
Physics also uses everyday examples to illustrate some of its concepts. In the case of a joule, it is estimated that it is: the energy used when throwing a small apple upwards so that it rises one meter ; the energy that is released when said apple falls.

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