How does a transformer make clicking sounds when being powered ON or when it is bucking/boosting voltages, without having any moving parts inside?
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Why do you think there is no part that moves?
There is no part that should that does not mean there is no part that does move. You have two coils with a lot of wire loops and usually an iron core too. The current creates a magnetic field and then they interact with the other parts you get forces too, that is how electric motors work.
Iron is ferromagnetic and is attracted to magnetic fields. A coil with a current is an electromagnet so there is forces between it and the iron core
The transformer that is mounded to are not rigid bodies, they can bend and the magnetic field result in them doing that to a small degree. That causes the sound you hear.
So parts do move even if it is something we designed them to do, we try to stop them from moving.
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