RR37 is correct, gfci prevents electrocution via ground fault, the rececptacle has a HOT terminal and a COMMON or NEUTRAL terminal which is connected to ground at your breaker panel, a ground fault occurs when the electrical path bypasses the COMMON terminal. e.g. through a faulty heater, into your water then through your body to a cement floor, and the floor doesn't have to be wet to make a good connection to ground. if you touch both terminals at the receptacle, you will get electrocuted because that is not a ground fault. also, if the electricity is arcing across a wet or faulty appliance and the path is not a ground fault then the receptacle will not trip and a fire will possibly be the result.
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