Ohm's Law is the foundational relationship in electrical engineering and electronics, describing how voltage, current, and resistance relate to each other in a circuit (V = I × R). This Ohm's Law calculator solves for voltage, current, or resistance when you know the other two values, instantly applying the correct formula based on what you're solving for. It's an essential tool for students learning circuit analysis, hobbyists building electronic projects, and professionals troubleshooting circuits. Whether you're sizing a resistor, calculating current draw, or verifying a circuit design, this calculator provides instant, accurate results based on this fundamental electrical principle.