Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law

Input Values

Result

What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance.

Ohm's Law Formula

The basic formula for Ohm's Law is:

V = I × R

Where:

  • V = Voltage (Volts)
  • I = Current (Amperes)
  • R = Resistance (Ohms)

Power Formula

Electrical power can be calculated using:

P = V × I = I² × R = V²/R

How to Use the Calculator

  1. Choose what you want to calculate (voltage, current, resistance, or power)
  2. Enter the known values in the appropriate fields
  3. Click "Calculate" to get the result
  4. View the step-by-step solution

Example Calculations

Calculate Voltage:

Current: 2 A

Resistance: 10 Ω

V = 2 × 10 = 20 V

Calculate Current:

Voltage: 12 V

Resistance: 6 Ω

I = 12/6 = 2 A