Ohm's Law is a fundamental principle in electronics and electrical engineering that defines the relationship between voltage (V), current (I), and resistance (R). It is expressed by the formula:

\[ V = I \times R \]

This calculator allows you to solve for any one of the three values when the other two are known. Simply enter any two of the following: voltage (in volts), current (in amperes), or resistance (in ohms). The calculator will compute the missing value automatically.

Use this tool to quickly determine:

• Voltage across a resistor
• Current flowing through a circuit
• Resistance of a load or component

Ohm’s Law is essential for designing, analyzing, and troubleshooting electrical circuits—especially in amateur radio setups, power systems, and DIY electronics.