alternator

[awl-ter-ney-ter, al-]
noun Electricity.
a generator of alternating current.

Origin:
1890–95; alternate + -or2

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Collins
World English Dictionary
alternator (ˈɔːltəˌneɪtə)
 
n
an electrical machine that generates an alternating current

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
alternator   (ôl'tər-nā'tər)  Pronunciation Key 
An electric generator that produces alternating current. The generator's coil is rotated (by a turbine, motor, or other power source), and its circular path causes it to cut cross a magnetic field (set up by strong magnets), first in one direction, then the other, with each cycle. The electric potential induced in the coil by this motion thus alternates between positive and negative once with each cycle, resulting in alternating current. See more at induction.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At the same time, the alternator replaced the generator.
In its new line, the crank turns a mini transmission that drives an alternator
  to charge onboard batteries.
Yes it takes additional electricity to crack the water, but the car is
  generating a current via the alternator anyway.
The power is then fed into the car's electrical system to reduce the amount of
  load on the alternator.
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