What unit is used to measure electrical resistance?

The unit used to measure electrical resistance is the Ohm. This is derived from Ohm's Law, which defines the relationship between voltage, current, and resistance in an electrical circuit. According to Ohm's Law, the resistance in a circuit can be calculated by the voltage across the circuit divided by the current flowing through it. This fundamental principle underlies much of electrical engineering and circuitry design.

The Ohm, represented by the Greek letter omega (Ω), quantifies how much a material opposes the flow of electric current. A higher resistance means that less current will flow for a given voltage, while a lower resistance allows more current to flow. Understanding resistance is crucial for ensuring that circuits function correctly and safely, as well as for troubleshooting problems in electrical systems.