Coil whine in my lamp? What?

[Casey Stadick]

I never thought that something that pulls such few watts could be so loud!! Since my assumption of coil whine is wrong, what exactly is coil whine?

 

[digitaldoc]

http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/67822-graphics-card-coil-whine-investigation.html

Here is some general info on coil whine.