Neutral function in 120 or 240
I'm confused on neutral completing a 120 or 240 volt circuit relative to the hot(s) and then having 0 voltage when relative to ground... How can it circumstantially have two different voltages?
Also, if we're dealing with 120 volt AC outlet 60hz single phase circuit, is the neutral still an alternating current conductor? Again and again I've read that the neutral in 120 solely carries the current to ground... that sounds like the characteristics of a dc circuit... so, if no voltage is applied to (maybe because it's a single phase circuit therefore poles donnot reverse) the neutral, the current takes the lease resistive path to ground, which in essence completes the 120 v circuit.
Is this correct? I'd like to know so I can discuss some other electrical ideas.
Thanks for any help!