When ordering electrical service in your exhibit, remember that watts and amps are not equal.
1 amp = 100 watts
It's one of those things that can add up quickly if you don't remember it. An ampere is a measurement associated with the strength of electric current; wattage or watts are the measurement of electric power in watts (most often associated with the power of a light bulb or fixture).
So, be familiar with how much power your computers, demos and liughts in your booth draw in amps and watts as you draw your layout for power in your booth.
(thanks to Jim Anderson, Steelhead Productions, and Wikipedia, for the content of this entry).