Impedance is the opposition by a system to the flow of energy from a source. For constant signals, this impedance can also be constant. For … See more

Adjusting the source impedance or the load impedance, in general, is called "impedance matching". There are three ways to improve an impedance mismatch, all of which are called "impedance matching":
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In RF connections, impedance matching is desirable, because otherwise reflections may be created at the end of the mismatched … See more

Telephone systems
Telephone systems also use matched impedances to minimise echo on long-distance lines. This is related to transmission-line … See more

Whenever a source of power with a fixed output impedance such as an electric signal source, a radio transmitter or a mechanical sound (e.g., a loudspeaker) operates into a load, the maximum possible power is delivered to the load when the … See more

Power factor correction devices are intended to cancel the reactive and nonlinear characteristics of a load at the end of a power line. This causes the load seen by the power line to be purely resistive. For a given true power required by a load this … See more

Acoustics
Similar to electrical transmission lines, an impedance matching problem exists when transferring sound energy from one medium to another. If the acoustic impedance of the two media are very different most … See more