I understand wireless headphones/earbuds. But the wired ones is a massive mystery. When they’re plugged in, how do they produce sound? (Sorry for English, I’m not a native Speaker.)
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When you put a voltage through an electrical coil it makes a magnetic field. The direction and strength of this field depends on the direction and intensity of the voltage. If you put a magnet in the middle of that coil the coil’s magnetic field will move the magnet. The signal that goes through the wire is identical (mostly) to the wave of the sound that comes out.
Wireless devices also need to do this to drive their speaker but they transmit their data digitally.
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