Markem wrote in
:

On Mon, 19 Aug 2013 17:00:39 +0000 (UTC), Doug Miller
wrote:

Markem wrote in
news:8mf4195abgnv84pjhaa9juqgj01kv60tuo@
4ax.com:

The two halves of the transformer are 180 degrees apart, not the
signal. Question what do you get when you add 120 and -120?

Wrong question.

The correct question is, "what is the potential difference between -120V and +120V?"

If you answered "zero" you fail.

I notice you didn't attempt to answer this one. Why is that, I wonder?