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Electrical Outlet Types
The most common type of outlet used in the United States is the 120 V 15 amp receptacle. But there are too 120 V 20 amp outlets. With circuits in the home normally found at 15 and 20 amp ratings.
The larger 240 volt receptacles are found in up 30 amp ratings to for higher consumption requirements.
To help prevent a mismatch in the outlet being connected with, the three prong connections are designed to accept those style plugs. There are 120/240 receptacles that are configured to accept both currents, although care should be taken to ensure that the correct amperage and plug pattern is being mated.
One of the greatest innovations in electrical outlets is the GFCI - the ground fault indicator, which interrupts the circuit when contact is made between water (or moisture) and the electric current. These are designed to protect against shock and electrocution.
Other kinds of receptables include:
Recessed Receptacles offer greater clearance for flush mounted wall items.
Safety Receptacles that integrate sliding coverplates that are intended to block objects from being inserted into the contacts.
Locking Outlets tie the connection together so that it cannot come apart. The plug interlocks with the outlet.
Floor Outlets that are wired to the flooring. Removable plugs are inserted into the prong slots when no plug is connected.