As the name states, during a ground-fault (when the current going out is significantly different than the current going in) the GCFI interupts the current. Usually by a switch of some sort. (Pushing the "test" button produces that click, and cuts off the current)
All of the answers above are correct
Answer: Prototypes had a problem with the bars colliding with each other and jamming. So the story goes that he arranged the keys with the most common letters in hard to reach spots, to slow typists down and try to avoid this problem.
Explanation: In the 1860s, a politician, printer, newspaper man, and amateur inventor in Milwaukee by the name of Christopher Latham Sholes spent his free time developing various machines to make his businesses more efficient.
Hope this helped!
