how loud speakers work:

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this is how loud speakers work, note, loud speakers do not use direct current because it only goes one way and so would end up preventing the electormagnetic coil from moving up and down.

(http://51speakers.com/wp-content/uploads/2011/02/Picture3-1.png)

When the electrical current flowing through the voice coil changes direction, the coil's polar orientation reverses. This changes the magnetic forces between the voice coil and the permanent magnet, moving the coil and attached diaphragm back and forth.

So how does the fluctuation make the speaker coil move back and forth? The electromagnet is positioned in a constant magnetic field created by a permanent magnet. These two magnets -- the electromagnet and the permanent magnet -- interact with each other as any…

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