power supply

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.

   • 1961 December, “Planning the London Midland main-line electrification”, in Trains Illustrated, page 722:

     The track-sectioning cabins house not only switchgear for the traction current, but also transformers to provide power supplies to the signalling equipment.

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.

• power adaptor / power adapter
• power brick
• power supply unit / PSU / P.S.U. / P. S. U.
• wall wart

• charger
• low-power mode
• power unit

• OED2
• “power supply”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.