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1 outlet does not mean 1 20 amp circuit, usually all the receptacles in that room will be on that circuit. So if you have other shit in that room you could run into problems.
The only thing that will happen is you will trip the breaker if that breaker draws more than 20 amps.
20 amps is plenty for what you sound like you have, unless you have like a heater and a bunch of other shit plugged in on that circuit in that room.
amps = watts divided by volts
so a 100 watt light bulb draws 9/10 ths of an amp.
you can add up everything your running and figure it out
where people run into problems and burn shit down is when they alter the breakers or fuses
(like the old penny trick) in the older screw in type fuses before circuit breakers became more commonplace
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