A device used in electronic circuits. It consists of a coil of wire wound around (typically) an iron core. An inductor will allow DC to pass effortlessly through it, but AC has a more difficult time. This phenomenon has to do with the creation and collapse of the magnetic field that is created as current passes through it. The science behind it is beyond the scope of what we can cover here. As the frequency of the AC signal goes up the inductor’s resistance to current flow also goes up. Technically this resistance that relates to the frequency of an AC waveform is known as impedance. Because sound waves are AC, this attribute makes inductors useful in amplifier circuits where certain frequencies need to be attenuated or specially routed. More windings of wire combined with increasing the amount of iron in the core of an inductor creates a more prohibitive path to higher frequencies. See also Coil.