Simple experiments in which I make a rudimentary speaker, but enough in order to understand it working.

A loudspeaker consists of a coil placed near a magnet. Also, the coil is stuck to a cardboard cone. When the electric signal, that carries the analog information of the audio, runs through the coil there is generated a magnetic field that interacts with the magnet, so the coil moves closer and away from it. This movement is carried to the cardboard cone that vibrates along and produces the corresponding sound waves.

https://en.wikipedia.org/wiki/Loudspe...
https://en.wikipedia.org/wiki/Sound
https://en.wikipedia.org/wiki/Transducer

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