Eli5 Why chargers make high pitched noise when battery is full?
In: 25
because it wants to be an ANNOYING PEICE OF Sihjsfhfddfmskldjf….
Sorry, I find squeally appliances super annoying.
Its basically because the power is being turned on & off very very rapidly. This way over-all there’s not much energy coming from the wall outlet and into your battery. How fast does it turn off & on? So many thousands of times per second you can hear it.
The battery is part of the whole circuit, right. So whether its flat or full can affect things. How it affects things is up to the tiny wee chip inside your charger that decides just how fast to turn the power on & off rapidly.
Depending on whether it needs to supply lots of power (a flat battery) or not much (a full battery) makes the chip change its mind about how fast its turning the power on & off.
Now how come you can hear it? Because if you squeeze components you can heat them up. If you heat them up they expand. If you put power through them they heat up. If you rapid fire power on/off at the components inside, some components heat up rapidly & cool rapidly, and thus expand/contract rapidly. That moves air rapidly. Your ears like that.
Its called being ‘microphonic’. Even the fanciest oscilloscopes will think they see electricity & show you squiggles on the screen if you simply thump it. True story.
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