On 30.07.19 11:34, rhkra...@gmail.com wrote: > Most residential power in the US is created using a single phase transformer > (so called because (1) it only takes power from one of the 3 phases mentioned > above and (2) darn -- it's a bitch getting old.
Tell me about it. ;-) I'd offer that (2) is simply that there's only one primary and one secondary, not three of each, on multiple arms of the core. > The secondary of that > transformer is center tapped with the center tap almost always grounded, such > that the other two taps from the secondary both produce 120 volts (RMS > nominal), but out of phase with each other by 180 degrees. Those details on this thread have been interesting, because 120v is unknown down under - and, I think, in the UK. Erik