Ohm's Law Calculator
Calculate Voltage, Current, Resistance, and Power.
Enter any two values to calculate the others.
Ohm's Law: The Foundation of Electronics
If you want to understand how electricity works, you must understand Ohm's Law. Discovered by Georg Ohm in 1827, it describes the relationship between Voltage, Current, and Resistance.
The Water Pipe Analogy
Visualize electricity like water: Voltage is pressure, Current is flow rate, and Resistance is pipe size.
Primary Formulas
V = I × R (Ohm's Law) and P = V × I (Power Law). All derived instantly.
Safety First
Understand the relationship between current and heat to prevent short circuits.
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