The short answer is yes you can plug in your coffee pot.
(It is your water hose you need to worry about.. But that is another thread)
Think of VOLTS as Pounds per square inch in a water system AMPS. Well that's the size of the pipe (Well wire gauge is amps is how much water the pump can pump)
30 amp you have one 30 gpm pump It pushes pressure to 120 PSI
50 amp you have TWO 50 amp pumps. One pushes, one pulls both do 120 PSI (240 differential total)
You can plug into either side of the 50 amp service and get 120 volts.
And to make it even easier.. YOU Don't have to figure it out. the RV does that for you. Amazing bit of technology.
One thing you DO need is a Proper surge Guard. like the Progressive Industries HW-50C. This way if there is any problem with those pumps... PROTECTED