What is the equation for Ohm's Law?

Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit, and the correct expression of this relationship is represented by the equation V = IR. In this formula, V stands for voltage (measured in volts), I represents current (measured in amperes), and R is resistance (measured in ohms).

According to Ohm's Law, the voltage across a conductor is directly proportional to the current flowing through it, given that the temperature and material properties remain constant. This fundamental principle is crucial in understanding how electrical circuits operate, allowing technicians and engineers to calculate the required parameters for design and diagnostics.

Other options focus on different relationships in electrical systems but do not directly represent Ohm's Law. For instance, the equation for power (P = IV) indicates the relationship between power, current, and voltage but shifts focus away from the direct connection of voltage, current, and resistance that Ohm's Law defines. The remaining options incorrectly attempt to articulate the relationships operating within electrical circuits in a way that doesn't align with Ohm's original formulation. Thus, recognizing V = IR as the expression of Ohm's Law is essential for mastering electrical concepts.