Computers use multiple DC voltages, and the power adapter is the external part of the power supply for a laptop. The additional DC voltages are created by internal circuits. Desktop computer power ...

You’ve probably noticed that everywhere you go — the doctor’s office, hotels, or retail shops, there are tiny PCs everywhere.

A computer power supply converts AC into multiple DC voltages ... For more details, see transformer. See power adapter. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires ...

The demo shows off a 90 W adapter pretending to run at 65 W. With this working, you could power the laptop from any supply that can meet the requirements for current and voltage.