Wattages of wall socket

All of the answers so far assumed that these are 110 V sockets.
If the ones in question really are for 12 V, the answer is different.

I like the way Mex put it. They are Fifteen-Amp Receptacles, yes. BUT... There are probably three or even more of them on one 15-Amp breaker. RV's don't tend to have the circuits divided up anywhere near as well as buildings.

Then again, the RV is very limited in its TOTAL electrical supply. You have a Fiver? You probably have "50 Amp" service, but if it's wired right, 12000 watts available to you. Our coach is 30 Amp, and that's only 3600 watts. So in a way, it doesn't matter how our circuits are divided up. Two fully loaded 15 Amp circuits and we're done.

For a 15 amp circuit the International Electrotechnical Commission specifies 15 amps x 125 volts = 1875 watts, for a 20 amp circuit 20 amps x 125 volts = 2500 watts.

From this Wiki webpage NEMA Connectors ...

"The 5-15R is by far the most common electrical receptacle in North America in buildings built since the mid-twentieth century. It is usually installed in a twin duplex configuration (which may be on a common circuit, or alternatively wired with each receptacle on a separate circuit, sometimes switched).

Internationally, the NEMA 5-15P plug and NEMA 5-15R receptacle are the basis for the International Electrotechnical Commission's IEC 60906-2 standard IEC system of plugs and sockets-outlets for household and similar purposes - Part 2: Plugs and socket-outlets 15 A 125 V a.c. and 20 A 125 V a.c."

Generally safe to 1625 watts total sum for the entire circuit. I assume this is an AC 15 amp receptacle?