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
Formula of Power
Examples
How to use the Ohm’s Law Calculator?
Calculator use

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 = V² 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.