Main Question or Discussion Point
Why is household AC 60hz? Is 60hz more efficient than higher frequencies, if so, why? I've searched on the internet but I can't find a good answer. Thanks in advance.
Electric clocks followed AC electricity by quite a long time.60 is useful for some electric clocks that use synchronous motors.
I visited an electric power plant once, and they had one engineer whose job was to keep the frequency as close to 60 as possible. This is not easy as the load varies. They said it was important for use in synchronous equipment.