power supply

Noun

power supply (plural power supplies)

1. Used other than figuratively or idiomatically: see power, supply.
   • The utility will invest in power plants and transmission lines to ensure a stable power supply.
   • The track-sectioning cabins house not only switchgear for the traction current, but also transformers to provide power supplies to the signalling equipment.1961 December, “Planning the London Midland main-line electrification”, in Trains Illustrated, page 722
2. A source of power such as the mains or a generator.
3. That part of a piece of electronic apparatus that provides appropriate voltages for the rest of the electronics from the connected AC source.