Ohm’s Law Calculator

Enter any TWO values to calculate the remaining quantities.

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Understanding Ohm’s Law

Ohm’s law describes the mathematical relationship between Voltage (V), Current (I), and Resistance (R). It states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance

Core Formulas

V = I × R
I = V / R
R = V / I

Power Relationship

P = V × I
P = I²R
P = V² / R

These equations are essential when designing Arduino, ESP32, robotics, and power electronics circuits. Engineers use them to calculate safe current levels, select resistors, and prevent overheating in real-world designs.

Ohm's Law Triangle
Ohm's Law Diagram