Technical Standards and Safety Authority (TSSA) G3 Practice Exam

Resistance is measured in Ohms, which is the SI unit for electrical resistance. This unit is denoted by the symbol "Ω." The concept of resistance refers to the opposition that a substance offers to the flow of electric current. According to Ohm's Law, resistance (R) is defined as the voltage (V) across a conductor divided by the current (I) flowing through it (R = V/I).

The other units mentioned serve different purposes: Volts measure electrical potential difference, Amps (or amperes) measure the flow of electric current, and Watts denote the rate of electrical power consumption. Understanding the distinct roles of these units is crucial in the context of electrical circuits and safety standards, as each measures a different characteristic of electricity. Therefore, recognizing that resistance specifically pertains to Ohms is essential for anyone working with electrical systems.