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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Clicking sounds are usually relays which are like switches that can be turned on electronically. So when the relay is turned on, there is a voltage applied to a coil inside it which creates a magnetic force that pulls a magnet to connect a circuit, and you hear a click. In fact you can hear these relays even in your gaming consoles sometimes. I think they are more of a safety measure.
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