Walwarts

Wall warts are not all the same. They are marked with the DC voltage and maximum current output. Some of them have different sized plugs and even reversed polarity. The components they belong to should be marked to indicate the voltage and polarity. If not, check the manual. Good luck sorting it out!

What Mink said essentially. They are AC/DC power transformers whose output differ in all the ways mentioned.

I googled walwart becsue I don't know that it it is...and walmart came up....

That's funny, Branislav! I initially thought Linisfarne's post said Walmart. The term "wall wart" is a slang term for a type of power supply that transforms AC power from an outlet into DC power. The transformer and other circuitry is contained in a box with the male connectors sticking out of it so the box sits directly on the outlet, so it's hanging on the wall.....uh....like a wart.