I have a bunch of these pcbs that i got from my profesor a while ago but I dont know what they are for, if you know please let me know. Thank you.

 

A psu of some kind, but something plugs into the black socket...

 

Welcome to AAC.

The best I can offer is a guess: A UPS for a micrnontroller or single board computer. It might help to see the other side.

 

GUESS!
Robotic Uninterruptible Power Supply (RUPS, see PCB silkscreen)
Micro USB for recharging (there is TP4056 Li-lon Battery Charger)
Black connector (2x8) for connection to robot providing power and status signals.

What did you professor teach?

 

With a PCB id of RUPS20 its definitely a battery-backed UPS with a USB charger input. I suspect its got a boost converter on board, probably for 12v judging by the 220u 16v smoothing cap.

Whats the part number marked on U4 - that looks to be the boost IC. The TSSOP14 device at U2, marked AC14, is a hex inverter probably to drive LEDs or off-board signals.

 

Could you try to draw the schematic? If you attempt that, identify all VCC and GND rails, first.

Before that, ask your professor.