SOS Mechanic Certificate – Electrical Practice Exam 2026 - Free Electrical Practice Questions and Study Guide

OHM's Law is a fundamental principle in electrical engineering and physics that establishes the relationship between voltage, current, and resistance in an electrical circuit. The law is typically expressed in the formula V = IR, which states that the voltage (V) across a conductor between two points is directly proportional to the current (I) flowing through it, with the resistance (R) of the conductor acting as the proportionality constant.

This relationship is crucial because it allows for the calculation of one of these three variables if the other two are known. Understanding this formula is essential for analyzing and designing electrical circuits effectively. When voltage is increased while resistance remains constant, the current will also increase proportionally, demonstrating a linear relationship.

This foundational relationship is used in various applications, from simple electrical circuits to complex systems, ensuring that electrical engineers can safely and effectively manage electrical power. The other statements outline different formulations of OHM's Law but do not present it in the foundational form typically recognized. These alternative expressions are derived from the original equation but do not capture the direct proportional relationship in its most fundamental way, which is why the initial formulation is widely regarded as the clear statement of OHM's Law.