hi, i would like to ask some questions about generators mechanical energy to electric energy generators such as the ones used in hydro electric dams, steam powerplants, gas turbine power plants and wind turbines. are there different classes of these generators? if so, what are they, and what power out put in mega watts do the create at a given rpm, what is the most efficient rpm ranges of these different generators. how much torque is required to over come the resistance of the friction and weight of the generators to spin at the specific rpm. is there a site i can go to read about the generators not necessarily power plants just the generators? what are the equations people can use to define these stats. i understand im asking alot in 1 question but does anyone know? or does any one know a site or something. please i need help with this information. i need to know all of it, please answer THE questions i asked. thank you
