A computer uses many different DC voltages. One is provided by the desktop power adapter and the other is provided by internal circuits in the computer itself. These combined give the computer what it needs. The desktop power adapter serves as the battery that is providing specific energy and volts to a specific computer it is plugged into.

GVE’s AC-DC power solutions include class I, and class II installations and support class 2, Limited Power Source (LPS) requirements.  From 3W to 300W & beyond, GVE AC-DC power supplies are designed to fulfill international requirements for EMC, safety, reliability, and energy efficiency in a wide variety of mechanical formats.
 
GVE-Desktop Power Adapter-GM39

GVE-Desktop Power Adapter-GM39

Input: 100-240VAC 50/60HZ 1.5A Dimension: 82.4*47.9*30.7mm/87.8*45.2*30mm/96*50*31mm