Väljundtakistuse

Väljundtakistus, often translated as output impedance, is a fundamental parameter in electrical engineering that describes the internal resistance of an electrical source, such as an amplifier or a power supply. It represents the opposition to the flow of current from the source to a load. When a source is connected to a load, the voltage across the load will be less than the source's open-circuit voltage due to this internal resistance.

The value of the output impedance is crucial for determining how efficiently power is transferred from the source to the load. In many applications, a low output impedance is desirable. This is because a low output impedance ensures that the voltage delivered to the load remains relatively constant, regardless of the current drawn by the load. This is often referred to as voltage regulation. High output impedance, conversely, can lead to significant voltage drops and power loss within the source itself.

The concept of output impedance is closely related to Thévenin's theorem, which states that any linear electrical network can be simplified to an ideal voltage source in series with an impedance. This series impedance is the Thévenin equivalent resistance, which is equivalent to the output impedance of the original network. Understanding and managing output impedance is therefore essential for designing and analyzing electronic circuits.