Question: what is the difference between a 15 amp circuit and a 20 amp circuit?
Answer: 20-amp receptacles have a horizontal slot branching off one of the vertical slots. Appliances, such as microwaves, often have 20-amp plugs and must be plugged into a 20-amp outlet. ... A 15-amp circuit is usually served by 14-gauge wire and is protected by a 15-amp circuit breaker or fuse.