LMS Substation 1st Year, Level II Practice Test 2026 - Free LMS Substation Exam Practice Questions and Study Guide

The unit that represents the SI measure of resistance is the Ohm. In electrical terms, resistance is the measure of how much a material opposes the flow of electric current. The Ohm is defined as the amount of resistance that allows one ampere of current to flow when one volt is applied across it. This relationship is governed by Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R), or V = I * R.

Understanding Ohm's significance is crucial for anyone studying electrical engineering or related fields, as it lays the foundation for analyzing and working with electrical circuits and components. Other units mentioned, such as the Volt (which measures electric potential), Watt (which measures power), and Ampere (which measures current), each play important roles in electrical theory but do not represent resistance.