Dusty R wrote:
GFI = Ground Fault Interrupter Is what they were called when they first came out/were required.
GFCI = Ground Fault Current is what they are now called, there maybe a slight difference.
A GFCI receptacle is most often the first receptacle on a circuit then all the other receptacle down the line are also GFCI protected, if properly wired.
Actually GFCI means ground fault circuit interrupter. They do not trip on over current. They trip if there is a ground fault (basically an abnormal leak of current to ground) in that circuit, as little as 5 ma.