How does a transformer make clicking sounds when being powered ON or when it is bucking/boosting voltages, without having any moving parts inside?
In: 5
Transformers have an iron core to more effectively close the magnetic field between coils on both sides. This core is made of sheets of iron instead of a single piece to reduce eddy currents.
Alternating current causes these iron sheets to quickly expand and contact and this causes vibrations which in turn cause that buzzing sound.
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