Simple Explanation

The unit used to measure how much something resists the flow of electricity.

Concise Technical Definition

The standard unit of electrical resistance or impedance, symbolized as Ω, indicating how much a device resists current flow in an electrical circuit.

Layman-Friendly Analogy

Like narrowing a water pipe—the more resistance (ohms), the harder it is for water (electricity) to flow.

Industry Usage Summary

In audio, ohms are used to describe speaker impedance (e.g., 4Ω, 6Ω, 8Ω). Matching speaker impedance with amplifier ratings is crucial for safe and efficient operation.

Engineering Shortcut

Ω = resistance/impedance unit; used for speakers, circuits, and loads.

Full Technical Explanation

The ohm (Ω) is the SI unit of electrical resistance, named after Georg Simon Ohm, who formulated Ohm's Law. In audio, it also represents impedance, which combines resistance with reactance (frequency-dependent opposition). An 8-ohm speaker presents more resistance than a 4-ohm speaker, requiring less current from the amplifier but potentially producing lower power output at the same voltage. Amplifiers must be rated to handle the speaker’s impedance; otherwise, mismatches can cause distortion, overheating, or failure. Ohms are also fundamental in designing crossovers, cables, and load matching across audio systems.