I would think that your boyfriend should be able to answer those questions!
What you can do is pick up a
power meter (Walmart) and then plug in various appliances to see how much current they take (the PS4, the TV, the hair dryer).
Once you have that data you can figure out what you can use and what you can't (simply add the #'s together--if they go over about 18amps then you can't use that combination).
I hardwired something similar in our coach so we always know about how much current/power we're drawing (
this guy (Amazon)). Turns out most of the high-current devices I have draw about 10-15 amps (and thus we can only use about two of them at the same time on our 30 amp circuit).
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