Basic Electrical
Ohm's Law Calculator
Solve any two parameters of Ohm's Law (V = I × R) and Power (P = V × I) instantly with live SVG circle visualizer.
Input Parameters
V
A
Calculation Results
Calculated Resistance (Ω)
—
Dissipated Power (W)
—
Recommended Component (Amazon (voltcraft-20))
View Recommended Part →
Precision Metal Film Resistor Kit (1% 1/4W 64 Values)
Tested and recommended for reliable hardware prototyping and accurate measurements.
Formula & Theory
V = I \times R \quad \& \quad P = V \times I
Frequently Asked Questions
Q: What is Ohm's Law?
Ohm's Law states that current through a conductor between two points is directly proportional to voltage across the points, inversely proportional to resistance.
Q: How to calculate power from voltage and current?
Power in Watts equals Voltage in Volts multiplied by Current in Amperes (P = V × I).