Wattage is volts times amps
that 80% rule is for continuous draw... the breaker trips at the %100 value
Go back to school please
DC wattage is voltage times amps.
AC wattage is voltage times amps times the
power factor.
The 80% thing is a design rule that an electrician has to follow if he wants the wiring to pass inspection.
The 80% rule has nothing to do with electricians or passing inspection
that is the design of a circuit breaker
electricians have rules as to wire size ... number of fixtures/outlets ... size of breakers
they must follow
yes ac wattage includes PF .. do you have any clue what power factor is