How does my $10 counter-top electric can opener know to stop after the
can rotates 360 degrees and the lid is severed all around and sticking
to the spring-loaded magnetic arm?

I don't see any kind of sensor or probe and the rotation can't be
time-dependent because it works with different diameter cans.

So how?

--
If people, who cross our border illegally are not Illegal€” then what are
they?
- @chuckwoolery