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Michael Faraday devised the world’s first electric generator in 1821. The generator he built was a seemingly simple thing: a hand-cranked copper disk rotated between the poles of a permanent magnet. DC GENERATOR Are used in recharging automobile batteries. A direct-current (DC) generator is a rotating machine that supplies an electrical output with unidirectional voltage and current. The field is produced by direct current in field coils or by permanent magnets on the stator. The output, or armature, windings are placed in slots in the cylindrical iron rotor. AC GENERATOR Are used in recharging automobile batteries. A direct-current (DC) generator is a rotating machine that supplies an electrical output with unidirectional voltage and current. The field is produced by direct current in field coils or by permanent magnets on the stator. The output, or armature, windings are placed in slots in the cylindrical iron rotor. MOTORS AND GENERATORS Compare the illustrations of a dynamo and a DC motor. The action of the dynamo is just the reverse of the action of a motor, The similarity between these two was not recognized until the mid-nineteenth century when an “accident” happened at the Vienna Exposition Hall in 1873. The 2nd dynamo began to spark and whine and come live. The dynamo had become a generator. The versatility of a device to act as a motor at one time and a generator at other times can be used to great advantage. In France and Australia, trains running uphill or on level ground are fueled by electricity from power lines. When the train moves downhill, however, its motor becomes a generator. The power generated is sent to the power lines to be used by other trains. This maintains a cycle of changes from gravitational potential energy to electrical energy.

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