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The Royal Spanish Academy (RAE ) recognizes two meanings of the concept of reluctance . The first meaning indicates that the term can be used as a synonym for reluctance : disgust or annoyance when having to perform a certain activity.

For example: “The orders of my boss generate reluctance because he always asks me to do things that I don't want to do”, "The reluctance of the players at the coach's indications were evident", "In the military confrontations there is no room for reluctance: we must comply with what the superiors say and period".

On an emotional level, we can say that there are people who clearly manifest a reluctance not towards a concrete event that happens to them but towards some feeling, value or "obligation" that exists in society. Thus, for example, we can underline that there are individuals who openly declare that they have reluctance towards commitment in matters of couple relationships.

There are many reasons that may have led them to take that position. However, among the most common are previous love experiences that caused them great pain or having grown and lived in an environment where relationships did not come to fruition and were linked to great problems.

The reluctance, on the other hand, is linked to the resistance that exerts a circuit or a material before a certain magnetic flux . This means that the circuit or material in question resists the passage of the magnetic flux, opposing its magnetomotive force .

It is a concept similar to that of electric resistance : in an electrical circuit, the current follow the path that offers the least resistance. In the case of a magnetic circuit, it is the magnetic flux that seeks to advance through the sector that exerts less magnetic resistance (that is, has less reluctance).

As the reluctance of the material or circuit increases, more is needed Energy to achieve the passage of magnetic flux through it.

In addition to all of the above, we cannot ignore the fact that reluctance, which is the relationship between magnetic flux and magnetomotive force, was a term that was coined in the 19th century. Exactly for the first time it was heard in 1888 and was invented by English physicist and mathematician Oliver Heaviside.

However, although it was the said scientist who coined it, it should not be overlooked that who took the first steps to discover as such the reluctance was the Danish physicist Hans Christian Oersted, who in 1813 came to predict electromagnetic phenomena . Moreover, his research and studies were what led to establish the basis of electromagnetism. Precisely for all that, we have to expose that the unit of reluctance is the Oersted, in homage to this man of science.

It is possible to calculate the magnetic reluctance from the following equation : the reluctance (which is measured in amp by weber) is equal to the length of the circuit on the magnetic permeability by the sectional area of ​​the magnetic core.

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