lähdeimpedanssin

Lähdeimpedanssi, also known as source impedance, is a fundamental concept in electrical engineering and physics, referring to the opposition to the flow of alternating current (AC) in a circuit. It is the impedance measured at the output terminals of a signal source, such as a generator or amplifier, and is a crucial parameter in the analysis and design of electrical circuits.

Source impedance is typically represented by the symbol Z_s and is expressed in ohms (Ω). It includes both the resistance and reactance of the source, which can vary with frequency due to the presence of capacitors, inductors, or other reactive components. The source impedance affects the power transfer efficiency and signal integrity in a circuit, as it determines how much of the source's power is delivered to the load and how much is reflected back to the source.

In practical applications, minimizing source impedance is often desirable to maximize power transfer and reduce signal distortion. However, in some cases, such as in impedance matching networks, a specific source impedance is required to optimize performance. Understanding and controlling source impedance is essential for engineers and technicians working with AC circuits, as it directly impacts the overall system behavior and performance.