Receptacles are not wired in series. Receptacles are actually wired in parallel, what this means is that all phase wires (black) in a receptacle's box should terminate to the brass screws on each device, and all neutral (white) wires in the box should terminate on the silver screws on each device.
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No. In a 20 amp circuit all wire has to be 12 AWG or larger.
In the United States and according to the NEC, in commercial and industrial installations, you are limited to 10 receptacles on a 15 amp circuit. The size of the wire is not a determining factor. There is no limit to the number of receptacles on a circuit in a home and there may be local codes where you live that have stricter requirements.
No, not in the North American electrical system. Opening up a neutral on a three wire circuit could create a series circuit if two devices are plugged into the same receptacle. This is how kitchen counter receptacles are wired in all new homes.
A wire terminal is used in electrical wiring. It is used to hold the wires when wiring switches and receptacles. There are different types of terminals including screw terminals.
A GFCI receptacle can extend its protection to regular receptacles connected to the output side of the GFCI. Each actual GFCI receptacle should be directly connected to a breaker in electric panel.