The essential difference between an AC generator and a DC generator is that:
(a) AC generator has an electro-magnet while a DC generator has permanent magnet.
(b) DC generator will generate a higher voltage.
(c) AC generator will generate a higher voltage.
(d) AC generator has slip rings while the DC generator has a commutator.
AC generator has slip rings while the DC generator has a commutator
Explanation - An AC generator has two rings called slip rings. These full rings help in changing the direction of current, thus producing AC current
A DC generator has two half rings called commutator. These half rings help keep the direction of current same, thus producing DC current.