Washington State Journeyman Practice Exam – Prep, Questions & Study Guide

Ohm's Law, which states that voltage equals current multiplied by resistance (V = I × R), is applicable to both direct current (DC) and alternating current (AC) systems. This fundamental principle in electrical engineering illustrates the relationship between these three key components, making it a versatile tool for analyzing circuits regardless of the type of current.

In DC systems, the current flows in one direction, leading to a consistent voltage and resistance relationship. In AC systems, the current periodically reverses direction, but the relationship defined by Ohm's Law still holds true when considering instantaneous values or effective (RMS) values. Thus, the law is not limited by voltage levels or the type of current, confirming it applies uniformly across different electrical contexts. This universal applicability is what makes Ohm's Law a foundational concept for understanding electrical circuits and principles.