What does the unit 'ohm' measure in terms of electrical properties?

The unit 'ohm' is a measure of electrical resistance in a circuit. Specifically, it quantifies how much a substance opposes the flow of electric current. The relationship is defined by Ohm's Law, which states that the voltage across a conductor is directly proportional to the current flowing through it, with resistance being the proportionality constant. This means that if a material has high resistance (measured in ohms), it will allow less current to flow for a given voltage. Therefore, when considering electrical properties, recognizing that resistance is expressed in ohms is crucial for understanding how circuits function and how components interact with each other. Understanding this concept is fundamental when working with electrical systems, as it helps in analyzing circuit performance and troubleshooting issues related to current flow.