Why does electricity make a buzzing sound?

Question

Was on the train and was hearing a pulsing buzzing sound for a few seconds, thought should I be worried

In: 9

Answer 1

I’ll add for fun fact that since all of our electricity (AC) has this “hum” happening in the background, that signal would be present in guitar pick ups and when run through an amplified you’d hear that “hum” happening. People didn’t love this so they developed a new pick up that loop back on themselves, essentially cancelled out the hum signal.

These pick ups are called “humbuckers” for this reason.