How do wired headphones produce sound if they don’t need to be charged before using them?

Question

How do wired headphones produce sound if they don’t need to be charged before using them?

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Answer 1

* All headphones work by causing the little speakers inside to move air.
* To get those speakers to move you need:
* An audio source
* a power source
* an amplifyer
* Wireless headphones cram all three of those into the headphones themselves including a radio wave receiver to get the audio from some other device.
* Wired headphones are just the speakers.
* The audio source, power source, and amplifier are all outside of the headphones.
* The only thing to goes to the headphones is the power used to move the little speakers in the shape of the audio signal.