WordReference Random House Unabridged Dictionary of American English © 2025
pow′er pack′, [Electronics.]
  1. Electronicsa device for converting the voltage from a power line or battery to the various voltages required by the components of an electronic circuit.
  • 1935–40

Collins Concise English Dictionary © HarperCollins Publishers::
power pack
  1. a device for converting the current from a supply into direct or alternating current at the voltage required by a particular electrical or electronic device

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