Think of it like a person pedaling on a bike. The 50/60 Hz is just how quickly they’re pedaling, it’s honestly pretty arbitrary how quickly they decide to pedal (well, it’s not for electricity, but the specifics of *why* a certain frequency is chosen is a bit complicated).
But in terms of the electrical grid, there isn’t just one person pedaling, it’s more like a tandem bike with a bunch of people pedaling. If one person were to attempt to pedal faster, they’d have to put in a lot of effort to speed everyone else up along with them. If they instead wanted to pedal slower, the pedals would outpace their feet and probably end up hurting them. So it is much more sensible for everyone to be pedaling at about the same speed.
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