# Ohm's Law Definition

In physics, Ohm's law is defined as the electric current passing between the two points of a conductor directly proportional to the Voltage between them. In other words, it is a relation among Voltage (V), Resistance (R), and current (I). Whereas, **Voltage **is defined as the **potential difference** between **two points**. **Current **is an **electrical charge** **passing **through a **conductor**, and **Resistance **is the **force that opposes** the **flow of an electric current**. **Ohm's law** is named after the German physicist **Georg Simon Ohm**, the first to verify Ohm's law experimentally.

**Table of Contents**

## Formula of Ohm's Law

To instantly determine Ohm's law, you can use the formula listed below:

V = I * R

**Where,**

V = Voltage of a circuit (represented as volts "v")

I = Current of a circuit (represented as ampere "A")

R = Resistance in a circuit (represented as ohm "Ω")

**Note:**

If you want to calculate Ohm's law, you can use our Ohm's Law Calculator.

### Example

For a more precise and clear understanding of the concept, let us solve an example below:

Suppose a resistor of 4 Ω is connected in your circuit with a current of 30 amperes across its terminals. Then find out the voltage passing through the circuit.

**Given data**

Current = I = 30 amperes

Resistance = R = 4 Ω

**To Find**

Voltage = ?

**Solution**

To find out the voltage passing through the circuit, we will use the formula listed below:

Resistance = R = 4 Ω

Putting values in the formula:

V = 30 * 4 = 120 volts