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Why is the laptop charger thing (transformer) making a noise? [duplicate]

Why is the laptop charger thing (transformer) making a noise? [duplicate]

The laptop power cable consists of two cables with a transformer in the middle. The transformer is making a tiny noise while plugged in. I think it's normal... is it normal? What is it exactly?

Asked by: Guest | Views: 318
Total answers/comments: 2
Guest [Entry]

"It's a transformer.

Not Optimus Prime, but a boring device that steps down mains voltage to the voltage your laptop requires.

A slight hum is normal."
Guest [Entry]

"Laptop chargers these days might be switching-mode power supplies with a transformer which operates at a much higher frequency than the 50/60Hz mains, because transformers work better at higher frequencies, and can be made smaller and lighter.

Is the noise high or low pitched?"