In what respect does the construction of an A.C. generator differ from that of a D.C. generator?

Construction-wise, the only difference between a D.C. generator and an A.C. generator is in the way the two ends of the generator coil are linked to the outer circuit. In a D.C. generator, we connect the two ends of the coil to a commutator consisting of two half rings of copper. In an A.C. generator, we connect the two ends of the coil to two full rings of copper called clip rings. There is no commutator in an A.C. generator.