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AC generator is a mechanical device which converts mechanical energy into AC electrical power.
DC generator is a mechanical device which converts mechanical energy into DC electrical power.
In an AC generator, the electrical current reverses direction periodically.
In a DC generator, the electrical current flows only in one direction.
AC generator does not have commutators.
DC generators have commutators to make the current flow in one direction only.
AC generators have slip-rings.
AC generators have slip-rings.
AC generators require very less maintenance and are highly reliable.
DC generators require frequent maintenance and are less reliable.
AC generators are very efficient as the energy losses are less.
DC generators are less efficient
It is used to power for smaller motors and electrical appliances at homes (mixers, vacuum cleaners, etc.)
DC generators power very large electric motors