Unknown metal part found in garage—can anyone identify this object or its use?

Hi
I found this in my garage from something that I probably disassembled and I don’t know what this is. Can i have help to find what this is please?
Thank you

That is a transformer, probably from a power supply for something (wall wart or similar, or maybe mounted inside a case.If you measure between the two yellow wires you'd expect to get anything from about 5 to about 25 volts AC when the plug is plugged into the wall.  Be careful when you do this in case there is a fault on it..The other wire may be a centre-tap of the main winding or it may be an earth (ground) wire, attached to the transformer ironwork.

Ok thanks you I will see this, maybe I gonna give informations.
Thank you