Which is used as rotor in the power generators ?

In single phase generators armature functions as rotor whereas in power generators armature functions as stator List out the other differences between single phase and three phase generators ?

Which part produces magnetic field for the working of a generator ?

The electricity generated at the power stations is transmitted to distant places in high voltage. What is the voltage at which electricity is generated in the power station?

Power factor is defined as the ratio of true power to apparent power:- Give an expression for power factor.

Which of the given does not indicate power

If a rotor in a power generator completes 3000 rotations in a minute. Which type of AC is produced here , single phase or three phase ?