I was thinking about how they work, am might be part of it but am isn't anything to do with how they detect movement, well not at more than a few cm
I've just reread yes it probably is that basic
im assuming this is about the difference between dual edge and quad edge elements. Can't see its logic vs pulse count. You could go leftfield and add alarmcom fuzzy logic ir220 into it
a. Ideally 13.69 but that is now 13.75 as most diag cant hit that resolution
b. Ohms law depends on the resistance and the distance. Resistivity is what matters. If the course is up to date id assume you discussed copper vs cca
id break em down. One post one question. I read the first then got bored mid way through the second. I don't know what the third was. Break it down and more will reply