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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Some transformers have moving parts. This allows them to adjust for changes in the bulk electric grid while maintainging a set output voltage. They have a mobile tap that can effectivly change how many windings are being used. Basically one side of the transformer has a conection that can move up and down the windings.
Monitoring equipment can make some noise or move about as well.
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