# Ohm’s Law Calculator

**Ohm’s law** states that the **voltage (V) across the conductor** is directly proportional to the **current (I) flowing through the conductor** and the **resistance (R) of the circuit**.

Ohm's Law is the relationship between voltage (V), current (I) in amperes, and resistance (R). Voltage refers to the potential difference between two points. The current is a carrier of an electrical charge, and the resistance is the opposition of the flow of an electric current. The SI unit of ohm’s law is the ohm(Ω).

There is another value that can be calculated by using ohm’s law, which is Power. The **amount of energy that is transferred per unit of time** is called **power **while the **rate at which the work is being done in an electric circuit** is called **electric power**. The SI unit of power is the watt(W).

**Table of Contents**

## Formula of Ohm’s Law Calculator

The formula of Ohm’s Law is listed below:

V = I x R

**Where,**

V = Voltage

I = Current (in Amperes)

R = Resistance

**Note:**

Read about Coulomb's law and our Coulomb's Law Calculator.

### Formula of Power

The formula of power is listed below:

P = V x I

We can use the above formula when voltage and current are given. As we know ohm’s law,

V = I x R

I = V / R

Putting the above equation in power formula that is

P = V x I

P = V^{2}x R

### Examples

**Example 1:**

Consider a 4-ohm resistor in a circuit with a voltage drop from 220V to 50V across its terminals. What is the current through the resistor?

**Given data**

R = 4 Ω

V = 220V – 50V = 170V

**To Find**

I = ?

**Solution**

We know,

V = I x R

We need to find the value of the current so, we rearrange the equation

I = V / R

Putting the values, in the above equation we have

I = 170 / 4

I = 42.5 A

**Example 2:**

If we have the battery of voltage 20V and current 3A, find the consumed power.

**Given data**

V = 20V

I = 3A

**To Find**

P = ?

**Solution**

We know,

P = V x I

Putting the values, in the above equation we have

P = 20 x 3

P = 60 w

### How to use the Ohm’s Law Calculator?

The steps to use Ohm’s law calculator are as follows:

**Step 1: **Enter the value of voltage in the first required input.

**Step 2: **Enter the value of current in the second required input.

**Step 3: **The calculator will automatically display an answer on the screen.

### Calculator use

You can find power and voltage using our ohm’s law calculator. The only thing you have to do is enter you’re your values in the required input fields and you will get your answer in the output.