Is it possible to hear electricity (or some byproduct)?

Ok, this is my day off. So I am at home, and this surge protector near my desk is make a very quiet, high pitched pulsing whine. Almost like what you hear from florescent lighting. (2sec whine…1sec silence…2sec whine…1sec silence…etc)

Is this the pulse of the electric current or something? I am not familiar with how electricity works outside of the basics.

I should also mention that I am sure it is the surge protector; when I turned it off the sound stopped.