Why do transformers hum ?

Subject: Why do transformers hum ?

Date: Tue Jul 31 15:57:44 2001
Posted by Guther
Grade level: grad (science) School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Engineering
ID: 996609464.Eg

Message:


I have often heard various AC/DC transformers issuing a low pitched hum whenever 
placed in operation. What can account for this noise ? They do not contain any 
moving parts to vibrate.

Re: Why do transformers hum ?

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