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ok, thank you. that clears up a tremendous amount of confusion with the graph showing L1 and L2 being 180deg out of phase with each other driving the electrical differentail ‘chasm” of 240v potential. That was never taught to me so i no longer feel like an idiot.
I guess I’m trying to fill gaps in my knowledge here. Please bear with me.
So then what is the purpose of a neutral line on a 240V appliance? To serve a load in a circuit that only needs 120V?
Yes exactly,this is what I’m referring to.
More specifically stuck on that a 120v heating element gets 120 from L1 and a neutral to work, but a 240v element only needs L1 and L2 to heat?
If both L1 and L2 are of the same voltage potential (electrically equivalent) then how do electrons flow if they don’t have a neutral return path like a regular 120V circuit does?
Yes of course. Both dryers and ovens.
Ok just got a bit confused.
I’m stuck on the conceptual scenario you described below:
“Now suppose you still have your feet on the L1 plate, and a plate at 120 vac (L2) is brought up and you press the palms of your hands into the plate. What happens to you?
Answer: Since you now have L1 at your feet and L2 at your hands, you have a voltage difference of 240 vac across your body. Result: electrocution, deformity, disfigurement, permanent organ damage, soiling undergarments, death.”
I understand 120VAC just fine. Hot (120V potential) neutral (0V potential) their voltage differential drives the current to flow.
In 240VAC however, doesn’t L1 (120) + L2 (120) just essentially create an L3 (240v) and they still need that neutral line 0VAC WRT, to create the voltage differential and drive current flow? I dont see how simply doubling the voltage to 240 will create the voltage differential if there is no neutral to connect to.
Nothing happens to me b/c I’m not completing the circuit I’m just touching neutral, not Line which would kill me barefoot on we ground.
Ok I think I’ve got it after a good nights sleep. For DC Polarity of the fan motor, the negative terminal of the battery connects to COMM and the Positive connects to the +13V…since the electrons flow from neg to pos.
I guess I was over complicating things.
Yes. Current flow is made of electrons traveling in a particular direction. With electrostatic attraction negative electrons are pulled into a space of positive electrical pressure and vice versa for electrostatic repulsion. AC–electrons go back and forth, DC they only go one way.
Still unclear on the definition of polarity at this point.
So COMM ( or ground in DC) acts just like the neutral (in AC) in completing the circuit for DC circuits? Confusing…?
Where does the term COMMON come from and why is it used instead of ground or neutral?
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I would have much rather gone with Square at this point.
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