What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering and physics that relates voltage, current, and resistance in an electrical circuit. The law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with resistance (R) being the proportionality constant. Therefore, the correct formulation of Ohm's Law is V = IR, where V represents the voltage, I represents the current measured in amperes, and R represents the resistance measured in ohms.

Understanding this relationship is crucial for analyzing and designing electrical circuits, as it allows for the calculation of one of these quantities when the other two are known. For instance, if you know the voltage and the resistance, you can easily calculate how much current is flowing through the circuit.

The other options presented represent different physical laws or equations: P = IV is the formula for electrical power, relating power to voltage and current; F = ma is Newton's second law relating force, mass, and acceleration; and m = density × volume describes the relationship between mass, density, and volume in fluids. While important in their respective fields, they do not define Ohm's Law.