Ohm’s law represents a fundamental element to explain certain phenomena related to electricity . More specifically, this law studies the relationship that exists between three concepts: current intensity, potential difference and electrical resistance. In its simplest formulation, the law establishes that the intensity (denominated I) that circulates through an electrical conductor is directly proportional to the potential difference (V) and, in parallel, inversely proportional to the resistance (R).
Ohm’s law allows us to explain the phenomenon of electric current
The electric current down the passage of electrons from one point to another through a conduit, for example, a copper wire. Thus, the current intensity refers to the amount of electrons that pass through a conductor during a certain period of time and its measurement unit is the ampere. Ohm’s Law
The potential difference, popularly known as voltage or electrical voltage, is the force that allows electrons to move through a conductor and its unit of measurement is the volt or volt.
Finally, resistance is the greater or lesser opposition that a given conductor presents in the passage of electrical current (for example, copper wire is a good conductor of electricity and therefore offers little resistance).
As a consequence of the relationship between these three concepts, its mathematical formulation is as follows: I = V / R
This simple formula explains how voltage, current and resistance are related: intensity is measured in amperes, resistance in Ohmios and voltage in volts, knowing that with two of these three pieces of data it is possible to obtain what is missing.
The discovery of Ohm’s Law took place at the beginning of the 19th century, a time when the generation of electric current was already known through the researches of Alessandro Volta. German scientist Georg Ohm (1789-1854) sought to further advances in the new fluid discovered by Volta and began experimenting on the properties of electricity using metallic bodies until he finally discovered the law that bears his name.
Ohm’s law was definitely improved by Maxwell’s electromagnetic theory
Although Ohm’s law was important in describing how electricity works, it should be noted that this law is not always enforced, as Georg Simon Ohm did not consider other laws involved with electricity (Kirchhoff’s laws). The set of electrical phenomena was not explained until scientist James Clerk Maxwell unified electricity and magnetism in so-called Maxwell’s Law.