power supply

a device that provides power to electric machines, generators, etc.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  power supply
Part of Speech:  n
Definition:  a source of electricity for a device, which converts, regulates, and transmits the external power for the device
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Computing Dictionary

power supply definition

power supply unit

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Enthusiasts consider that a small price to jump-start a new industry and start
  decarbonising the power supply.
If their flow becomes more irregular, so will power supply.
One area in which they have not improved, though, is their power supply.
Upgrading the city's power supply, and making it far greener, seems certain to
  be one crucial battleground.
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