lähtöimpedanssia

Lähtöimpedanssi, or output impedance in English, is a fundamental concept in electrical engineering that describes the opposition to alternating current flow within a source device, such as an amplifier or a signal generator. It is represented by the symbol Zout and is measured in ohms. This impedance is a complex quantity, meaning it has both a resistive and a reactive component, though in some simplified analyses, only the resistive part might be considered.

The output impedance is a characteristic of the internal circuitry of the source. When a load is connected to the source, the output impedance, along with the load impedance, determines how much current flows and how much voltage is delivered to the load. A lower output impedance generally means the source can deliver more power to a wider range of loads without significant voltage drop. This is often desirable in audio amplifiers, for example, to ensure consistent sound quality regardless of the speaker's impedance. Conversely, some applications might benefit from a higher output impedance. Understanding and controlling output impedance is crucial for efficient power transfer, signal integrity, and proper circuit design.