Hi, I am struggling with finding info on Electrical Phases. I understand that Single Phase is simply one ac signal, and I understand that 3 phase is 3 independent ac signals, all of which are exactly 120 degrees out of phase. My struggle comes in when I think about 220 volt dryer hookup in my house. There are 3 legs...2 'hots' and a ground. The 2 hots are each 110 volts. 1. But are they in phase or out of phase? I think they are out of phase in order to get 220 volts between the hot legs, right? 2. Are they 180 degrees out of phase? 3.What makes them 180 degress out of phase?