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
the wide tolerance option was added to keep with honeywell
the regs are very tight, too tight imo to the point of it not working without a bit of grey.