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RE: "How electricity flows in an AC circuit"

In an AC circuit such as a speaker cable is part of there are two wires involved, + and - . The free electron motion direction on one wire is always opposite to the electron motion on the other wire at any given point in time. This motion of electrons is referred to as "moving charges." Alternating moving charges, and moving charges = current. The Moving Charges induce an electric field. The electric field moves along with the moving electrons, but very slightly since electrons move very slowly, but it does move.

It is that "moving electric field" that in turn produces a *magnetic field* - and this magnetic field interacts with the large permanent magnet attached to the speaker (and voice coil) and causes the speaker diaphragm to move outward and inward according to + and - wires. This back and forth movement of the speaker diaphragm occurs at the instantaneous frequency of the audio waveform that's being produced by the amplifier.

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