Yep. To expand on that- your camper basically has 2 electrical systems:
- 12v which runs from your battery and powers things like lights, slides, tongue jack motor (or landing gear for fifth wheels), furnace, water heater (if on propane) and sometimes the fridge (again, if on propane). The camper has a converter which charges the battery and can provide 12v by converting 120v to 12v.
- 120v which basically runs anything with a normal household plug: most TVs, power sofas like you're seeing, microwave, and things like that.
A great reference is:
The 12volt Side of Life (Part 1)