Physics 2008 JAMB Past Questions - Question 42: The dc generator has essentially the same components as the a.c generator except the presence of .

Correct Answer

C

Explanation

To correct an A. C. Generator wit a D.C generator the slip ring is replaced with split ring communicatorA direct current (DC) generator does share many components with an alternating current (AC) generator, but there is one key difference: the presence of a commutator in a DC generator.

In an AC generator, the rotating armature (usually a coil of wire) generates an alternating current as it rotates within a magnetic field. There is no need for a commutator because the direction of the current naturally changes as the armature rotates within the magnetic field.

In contrast, a DC generator needs to produce a unidirectional (constant) current, and this is achieved through the use of a commutator. The commutator is a split ring that rotates with the armature and periodically changes the direction of the current in the coil as it rotates within the magnetic field. This reversal of current direction results in a direct current output from the generator.

So, the key difference between a DC generator and an AC generator is the presence of a commutator in the DC generator, which is not required in an AC generator.