Question: what is the difference between a 15 amp plug and a 20 amp plug?
Answer: 20-amp receptacles have a horizontal slot branching off one of the vertical slots. ... A 15-amp circuit is usually served by 14-gauge wire and is protected by a 15-amp circuit breaker or fuse. A 20-amp circuit, protected by a 20-amp breaker or fuse, must be served by 12-gauge or 10-gauge wire.