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The alternating current running through these power lines changes direction constantly. A full cycle back and forth, 50 times a second. 60 in some of the parts of the world, but here in Europe, 50 times a second. But that transmission isnt perfectly efficient. There are imperfections and stray electromagnetic fields. And a little bit of that power becomes vibration, which makes sound at that frequency of 50 hertz. Or 100, or other multiples of 50. Thats the mains hum you can sometimes hear coming from power lines, or maybe from speakers that arent quite plugged in properly. Also, that hum isnt exactly 50 cycles a second. The grid frequency shifts slightly and constantly over time as the engineers in charge balance supply and demand. Its only a tiny fraction of a shift, but its there. The whole grid runs at the same, slightly wobbling, almost-50 hertz, no matter where you are. That mains hum can be really annoying for people recording audio. You can hear it in the background
