Originally Posted by jburd964
if something is plugged into one of the up stream plugs, how would that effect the voltage reading of down steam outlet in series across hot side?
A resi. outlet "looks like" ~120v in series with ~0.3 ohm. A 10 A load will drop the voltage at a particular outlet and outlets downstream of it by ~3v, e.g., from 120v to 117v or 110v to 107v.
"The Thévenin equivalent can be used as a good model for a power supply or battery (with the resistor representing the internal impedance and the source representing the electromotive force). The circuit consists of an ideal voltage source in series with an ideal resistor."
so the entire PoCo - from an outlet - all the way back to the generators and turbines - can be represented by 120v in series with 0.3 ohm.
At your load center it's 240v in series with slightly more than 0.02 ohms.
A car battery? 12.8 v in series with about 0.02 ohms but the 0.02 depends on the current draw and several other things.