It is a law postulated by the mathematical physicist Georg Simon Ohm which tries to explain how electricity behaves, so it is closely linked to the values that correspond to the basic units of any electrical system such as: Intensity, Voltage and Resistance.

Ohm's law. | https://www.wikipedia.org/

These three terms can be described as follows:

Intensity: It is the circulation of electrons that goes from one point to another in a conductor and its unit of measurement are Amperes [A].

Voltage: It is the force that allows electrons to have movement in a conductor and its unit of measurement is Volt [V].

Resistance: It is the opposition that presents a conductor to the passage of electrons and its unit of measurement are Ohms [Ω].

Currently our life is full of electronic devices, some of them simple and others complex, but they all have a similarity, electricity, and that is that all electronic devices need electricity which in turn needs to be carried from one point to another through the use of an electric conductor and if we remember, every conductor will present opposition to the passage of current to a lesser or greater extent.

That is why Ohm's law is considered fundamental for modern electronics and perhaps for the electronics of the future if we do not discover a conductor that has zero resistance.

Below we show you the postulate of Ohm's law:

The intensity [A] of current that circulate in a conductor is directly proportional to the potential difference [V] that exists between its terminals and inversely proportional to the resistance [R] that that conductor presents to the passage of that current.

The postulate can be summarized in a simpler and understandable way as a formula which tells us that the intensity is equal to the voltage divided by the resistance of the element that we are analyzing, you can see this formula below.


Explanation of the formula.
According to the law, the value of the voltage is directly proportional to the value of the current, so if the voltage increases or decreases, the intensity will also do it in the same proportion as long as the value of the resistance remains constant. On the other hand, because the value of the resistance is inversely proportional to the current, if the resistance increases the current will decrease, while if the resistance decreases the intensity will increase.

Variants of the formula.
Due to the postulate of the law in most cases you could find the formula as we here show you previously, however depending on the needs can be found either for Voltage or Resistance. Below we show you these variants.

Formula for voltage.

Formula for resistance.