Because of their high amperage, 20A outlets often come with GFCI protection that helps prevent electrocution. [3] X Research source
Think of it this way: the more slots, the more amps.
If a 20A outlet is put on a 15A circuit, the breaker could pop or blow a fuse. It’s difficult to find a 15A outlet that will fit onto a 20A circuit breaker because of this. Keep in mind that the amperage outlet cannot exceed the circuit’s amperage.
On the other hand, 15A outlets are universal because they can be placed on a 20A circuit if needed.
As a general rule, if what you’re plugging in requires a lot of power, use a 20A circuit and outlet. 20A outlets need an individual branch circuit so that there’s only one recipient of electricity at the end of the connection. 15A outlets can be on the same circuit, as long as the electrical load doesn’t exceed 15 amps.
