I am certain this question has been asked before but I search and cannot see anything just yet. I read most AC current is 60 cycles per second in the United States and some say 50 but that does not matter to the question.
I am thinking a typical electric generator belonging to a hydroelectric plant generating power. The generator has some value for the revolutions per second as the water produces mechanical motion to spin its rotor. As the rotor spins the polarity switches from positive negative and visa versa. Is it the case that this value is the same as the 60 cycles per second that feeds into my home?
The transformer I believe does not affect frequency so must the frequency produced at the generator match the value at the electric plug. It is such a precise value I have difficulty thinking it is the speed of the generator but I do not know so I ask.