What is the difference between ac generator and dc ganerator

The AC generator, or more properly, alternator, produces an output voltage that varies both in amplitude and time. A DC generator produces a steady output voltage that does not vary in voltage, or time. Actually, a DC generator could produce an AC output. It doesn't because the voltage is picked up from what is known as a commutator ring. read less

The main difference between a DC generator and an AC generator lies in the manner in which the rotating coil is connected to the external circuit containing the load. In an AC generator, both ends of the coil are connected to separate slip-rings which co-rotate with the coil, and are connected to the external circuit via wire brushes. In this manner, the emf seen by the external circuit is always the same as the emf generated around the rotating coil. In a DC generator, the two ends of the coil are attached to different halves of a single split-ring which co-rotates with the coil. The split-ring is connected to the external circuit by means of metal brushes.. This combination of a rotating split-ring and stationary metal brushes is called a commutator. The purpose of the commutator is to ensure that the emf seen by the external circuit is equal to the emf generated around the rotating coil for half the rotation period, but is equal to minus this emf for the other half (since the connection between the external circuit and the rotating coil is reversed by the commutator every half-period of rotation). The positions of the metal brushes can be adjusted such that the connection between the rotating coil and the external circuit reverses whenever the emf generated around the coil goes through zero. In this special case, the emf seen in the external circuit is simply \begin read less

The AC generator generates an output voltage that varies both in amplitude and time. A DC generator generates a steady output voltage that does not vary in voltage or time.induction. In AC generators, the coil in which current flows is fixed, and magnet moves . The magnet's poles moves poles cause the current to flow in opposite directions which in turn produces an AC.In DC generators, the coil in which the current flows rotates in a fixed field as the two ends of the coil are attached to a commutator. Metal brushes connect split rings to an external circuit. The commutator produces the current that does not change direction. Read more : http://www.ehow.com/list_7636332_differences-between-ac-dc-generators.html With DC generators, the coil through which the current flows rotates in a fixed field. The two ends of the coil attach to a commutator: different halves of a single, rotating split ring. Metal brushes connect these split rings to an external circuit. The commutator balances the charges leaving and returning to the generator, resulting in a current that does not change direction. Read more : http://www.ehow.com/list_7636332_differences-between-ac-dc-generators.html read less

A generator produces electricity in a form of sine wave: first it is positive and then negative. To generate AC electricity, the central shaft carrying windings - which is called the rotor - has slip rings connected to the ends of the winding. In a single-phase generator, the outer slip ring is attached to one end of the rotor's winding and the inner slip ring is attached to the other end of the rotor's winding. (In a three-phase alternator there are three separate windings and three sets of slip rings. Each slip ring is connected to the ends of one pair of the windings in such a manner that no windings are shorted-out.) The slip rings are touched by fixed brushes to take off the AC current. To generate DC electricity, the central shaft carries a part called a "commutator" which has many separate segments. Each segment in sequence around the commutator is connected to the opposite ends of the rotor's winding . As the rotor spins round, two fixed brushes diametrically opposite one another connect to those segments one by one. Thus, as the rotor spins, one brush always picks up the positive wire from the winding and the opposite brush picks up the negative wire from the winding. read less