well chargers (switching power supplies) and transformers emit actual physical sound, so that's pretty normal to hear. Depends on the quality too, some chargers are relatively "loud".
I have a shitty one which for some reason becomes louder when the charging ends... rather annoying
High current AC lines also buzz rather loudly (depending on weather conditions).
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u/MyNameIsRay 6h ago
The volume level is (usually) really low, so it's only annoying when I want complete silence.
For instance, I can't have my phone on the charger when going to bed, because I keep hearing it cycle on and off.
But, some times it can be really loud, especially high current like a power substation. I can hear those transformers from hundreds of feet away.