With DC machines, the voltage generated by an individual armature coil is an alternating quantity which is rectified mechanically by the commutator. If we dispense with the commutator and revert to the slipring model of figure 2.1, we have a rudimentary AC generator. Practical AC generators are essentially simpler than their DC counterparts and are more easily designed in very large sizes; but a more important reason for their adoption is the possibility of using transformers to raise the voltage level for power transmission over long distances, and then to reduce it again for domestic or industrial consumption.
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