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In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.

A continuous range or spectrum of frequencies that extends from one limiting frequency to another.

Attenuation is the loss of signal strength in networking cables or connections. This typically is measured in decibels (dB) or voltage and can occur due to a variety of factors. It may cause signals to become distorted or indiscernible.