Most residential wiring is 15A except for bathrooms.

And kitchens.

Otherwise, running your microwave, toaster, and coffee maker at the same time would likely trip the breaker.

And obviously, the stove/oven is on its own circuit unless it's gas.

My kitchen has at least 2 120VAC circuits, which seems to avoid this.

NEC code requires 2 separate 20 amp circuits in a kitchen. Usually they split the circuits across a countertop or window. It's been code since ... as far as I can tell, pretty much forever. Unless you're living in a house that is either non-compliant or built before NEC was required, then it should have this kitchen arrangement.

Most kitchens don't run on only one circuit for the obvious reasons you've described.

Don’t forget garages, too.