Is it OK to use 15 amp receptacles with 12 gauge wire?
If you are asking about wiring in conformance with the USA National Electrical Code, 15 amp receptacles are often used with 12 gauge wire. The only problem may be in using the quick-connect feature where you just stick the wire in a hole and it is automatically caught and retained. Those are only for 14 gauge wire. With 12 gauge, you need to use the screw terminals. You can use 15 amp outlets on either 15 or 20 amp circuits. 12 gauge wire is the minimum for 20 amp circuits. 14 gauge wire is the minimum for 15 amp circuits. Knowing the proper wire size is only one of many requirements for wiring. If you have to ask about that, there are probably other things that you don't even know to ask about. Do you know how to determine how many wires are allowed in a given size box?