Ohm's Law Calculator

Developed by Hemant Parashar, B.Sc.

Calculate Voltage (V), Current (I), Resistance (R), or Power (P) using Ohm's Law. Simply input any two known values to compute the remaining two variables.

General Purpose Disclaimer

This tool is developed for educational and quick reference purposes. Calculations should be verified independently for critical applications.

Enter Any Two Known Values

Voltage (V)

Current (I)

Resistance (R)

Power (P)

What is Ohm's Law?

**Ohm's Law** is a fundamental principle in physics and electrical engineering that defines the relationship between Voltage, Current, and Resistance in an electrical circuit. It states that the current passing through a conductor between two points is directly proportional to the voltage across the two points.

The Basic Formulas

            V = I × R   |   P = V × I
          

Where:

**V (Voltage):** The electrical potential difference measured in **Volts (V)**.
**I (Current):** The flow of electric charge measured in **Amperes (A)**.
**R (Resistance):** The opposition to the flow of current measured in **Ohms (Ω)**.
**P (Power):** The rate of electrical energy consumption measured in **Watts (W)**.

Ohm's Law Matrix Formulas

Using algebraic manipulation, we can solve for any variables:

**To find Voltage:** $V = I \times R = P / I = \sqrt{P \times R}$
**To find Current:** $I = V / R = P / V = \sqrt{P / R}$
**To find Resistance:** $R = V / I = V^2 / P = P / I^2$
**To find Power:** $P = V \times I = I^2 \times R = V^2 / R$

This tool was developed and verified by Hemant Parashar, B.Sc. Graduate, to provide high-quality educational physics resources.