Just figured that out, did you?
Now, take a look at the cords with multiple outlets - cords that are only #16 wire ... even a single 15 amp appliance has that cord overloaded.
Look inside one of those outlet strips with integral 15 amp breakers, and you'll find the internal wire is best described as 'dental floss gauge.'
If household wiring followed the same voltage drop advice as we are given for using extension cords, we'd wire houses in #8.
When reality conflicts with theory ... and everything is working fine ... it's the theory, the basic assumptions, that need to be reconsidered.
