Ohm’s Law Calculator
Calculate voltage, current, resistance, and power using Ohm’s Law. Understand the relationship between electrical parameters with this free calculator.
Step 1: Enter Known Values
Ohm’s Law Formula
V = I × R (Voltage = Current × Resistance)
P = V × I (Power = Voltage × Current)
Enter any two values to calculate the other two.
Step 2: Calculation Options
About Ohm’s Law
Ohm’s Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.
Ohm’s Law Calculation Results
Calculated Value
Ohm’s Law Formulas
| Parameter | Formula | Unit | Description |
|---|---|---|---|
| Voltage (V) | V = I × R | Volts (V) | Electrical potential difference |
| Current (I) | I = V ÷ R | Amperes (A) | Flow of electric charge |
| Resistance (R) | R = V ÷ I | Ohms (Ω) | Opposition to current flow |
| Power (P) | P = V × I | Watts (W) | Rate of energy transfer |
| Power (alternative) | P = I² × R | Watts (W) | Power from current and resistance |
| Power (alternative) | P = V² ÷ R | Watts (W) | Power from voltage and resistance |
Understanding Ohm’s Law
Ohm’s Law is fundamental to understanding electrical circuits. It describes how voltage, current, and resistance are related. If you know any two of these values, you can calculate the third using the appropriate formula.
Common Electrical Examples
| Application | Voltage | Current | Resistance | Power |
|---|
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