"Tony Hwang" wrote in message news
wrote:
On Sat, 16 Nov 2013 01:17:23 -0500, Wes Groleau
wrote:

On 11-15-2013, 19:58, wrote:
180 degrees, but technically, no. It's opposite sign, not 180 degrees
out of phase.

Same thing

No, it's not. It's one phase.

Hi,
It's called bi-phase. aka Edison circuit.

No, it is single phase, or split phase. Only one phase is
used and is center tapped to split the voltage. It is
impossible for this circuit to be out of phase with itself.

Bi, or to be more precise, two-phase, is a rare entity that
is primarily used in military applications, specifically in
aviation. My old Air Force generator had the ability to
provide two-phase, and pretty much anything else that you
wanted from selection of voltage to three-phase delta or wye.