What is a 20 amp breaker?

Answer 1

For residential occupancy there is no code for the number of outlets. It depends on the load that is going to be applied to these outlets. In an average bedroom I would limit the outlets to no more than 12 unless it is going to be used as an office. In that case limit it to 10. If the lights are on the same circuit then limit it to a combination of 12 counting the lights and outlets. For a residential occupancy, there is no Code limit or load per receptacle. The number of required branch circuits is determined by calculations stated in article 220 of the nation electrical code and are related to square footage. Certain branch circuits, such as kitchen, laundry, and bathroom cannot serve other areas.

That said, it is good practice to limit the number of general purpose lighting and general purpose outlets per circuit. Your local inspector may choose to be more stringent than the actual Code requirements.

Answer 2

A 20 amp breaker is a device that opens, or turns off, or "trips", when the current of the circuit exceeds 20 amps.