The **Ohm ‘s law** shows a **linear relationship** that exists between the **voltage** and **current** in a **circuit** power. The voltage drop and resistance are responsible for establishing the **flow** of **current** through the resistance.

**Unit:**Volts**Symbol:**V**Formula:**V =*R*ㆍ I

## What is Ohm’s Law?

Ohm’s law is a theory that explains how **electricity** behaves depending on **current** , **voltage,** and **resistance** . It says that the intensity in a conductor of electricity is supplied by the **voltage** and that it is parallel to its **resistance** .

- Who Proposed Ohm’s Law
- History
- Goals of Ohm’s Law
- Statement
- Formulas
- Units
- Explanation of Ohm’s law
- What is it for
- Curiosities
- Conclusions
- Examples of Ohm’s Law

## Who Proposed Ohm’s Law

The creator of the law was **Georg Ohm** , he was born on March 16, 1789, in Erlangen, **Germany** and died on July 6, 1854, in **Munich** . Ohm was a professor of mathematics at **the Jesuit College** in Cologne in 1817. He was a renowned **German physicist** who discovered the law, which bears his name, which says that the current flow in a conductor is directly proportional to the difference in voltage. and inversely proportional to resistance.

His work began to be recognized and in 1841 he was awarded the **Copley Medal** of the **Royal Society of London** and became a foreign member a year later. The **ohm** , the physical unit that measures **electrical resistance** , also got its name.

## History

It can be said that Ohm’s law was born at the beginning of the 19th century, and that it was discovered by the mathematician and physicist **Georg Simon Ohm** . At that time the **electric current** was already known , through the inquiries of Volta Alejandro. However, Ohm wanted to delve into Volta’s research and began to experiment with the properties of **electricity** . He used metal parts, until he discovered Ohm’s law, in honor of his name.

It is important to mention that the law works as an excellent contribution to the **electronics** branch . The law was perfected by the theory of the scientist Maxwell in which he unified **magnetism** with electricity.

## Goals of Ohm’s Law

The objectives that have Ohm’s law are the following:

- Identify and analyze
**electrical phenomena**. - Establish the differences between
**static**electricity and**electric**current . - Understand the structure of the
**atom**and the forces between its particles. - Identify
**electrostatic**and**electrodynamic**phenomena . - Know the operation of
**electrical elements**. - Recognize the elements that make up an
**electrical circuit**.

## Statement

We can say that Ohm’s law is the description of the relationship between current, voltage and resistance. The amount of constant current through a large number of materials is directly proportional to the difference in potential or voltage between the materials.

## Formulas

The electrical resistance R is the factor obtained using the following formula:

**V = R **

**ㆍ**

**I**

Where V is the potential difference, *R* is the resistance and I is the intensity of the current.

To refer to generalizations of the law or formulated by Ohm it is used **: J = σE**

where **J** is the current density at a given location in the **resistive** material , **E** is the **electric** field at that location, and **σ** (sigma) is a material-dependent parameter called **conductivity** .

## Units

The basic units of Ohm’s law are as follows:

- Tension (E)
- Intensity (I)
- Volts (V)
- Ampere (A)
- Resistance (R)
- Ohm ꭥ
- Power (P)
- Watt (V)

## Explanation of Ohm’s law

Ohm’s Law is one of the most primordial postulates of **electronics** and **electricity** , it was postulated by the German **mathematician** and **physicist** Georg Simon Ohm, and establishes a relationship between the intensity of the **current** flowing through a conductor and the voltage or voltage. between its terminals, this relationship is completed by a proportionality factor called **electrical resistance** .

## What is it for

Ohm’s law helps us to see the relationship that can be given between the most distinguished **parameters such** as **current** , **voltage** and **resistance** . It is important because regardless of whether the circuit is simple or wide, if the **behavior** of the **electricity** within it can be anticipated before connecting it. Once you have knowledge of at least two of the parameters mentioned above.

## Curiosities

One of the curiosities of Ohm’s law is that it tells us that the **current** circulates in a **closed ****circuit** which is subjected to a **potential** difference but is proportionally applied and inversely proportional to its **resistance** . As the volts increase, the intensity increases.

## Conclusions

The conclusions that we can obtain from Ohm’s law are the following:

- The higher the
**voltage**, the better the**resistance**margin of error . - It is noticeable that the voltage
**fluctuation**influences the measurements that are made, which does not allow the correct taking of the**values**. - By transmitting
**voltage**to the resistors, they become part of the**heat energy**. - The
**resistance**is opposition to the flow of**electrons**. - The intensity is directly proportional to the
**voltage**and inversely proportional to the**resistance**.

## Examples of Ohm’s Law

Some examples of how to apply Ohm’s law are as follows:

**Example 1: Calculate the resistance where there is a voltage of 5 V and a current of 500 mA**

- R = V / I
- R =?
- V = 5V
- I = 500 mA = 0.5 A
- R = V / I = 5 / 0.5 = 10
- The resistance is 10 W

**Example 2: Calculate the voltage in a circuit in which there is a current of 2.5 Amps with a resistance of 50 W.**

- V = RI
- R = 50 W
- V =?
- I = 2.5 A
- V = RI = (50) (2.5) = 125
- The voltage is 125V