How does an RV plug in?

The plug on your RV is a large three-prong, heavy duty 30 Amp, 120-volt plug. If you go to a campground that has a regular house type outlet there are adapters that you can use to go from your RV plug to the house type outlet. When you do this you are plugging into a 15 Amp or 20 Amp power source.

Can I plug my camper into 220v?

Outlets configured to deliver 220v should not be used directly for an RV application. The RV system requires 120 volts. Putting 220 volts into an RV electrical system will damage or destroy the appliances and other systems in the RV.