| Electronics > Beginners |
| Isolation transformer and electrons |
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| ArthurDent:
nForce - "So if I understand correctly: When we make a short circuit on the grid, those electrons flow from a transformer through wire into ground. " No, no, no! Read what I posted. The ground (earth) is only a safety connection that the zero volt reference wire (neutral) is connected to at many points along the distribution route. If all the wires from the poles to the ground were removed the system would still function because, as I said: there is always a neutral wire that is connected to these ground rods at many poles and connected to neutral throughout the entire system without relying on ground except for safety. The electrons have no perspective, they could care less, but they are absolutely law abiding and follow ohms law to the letter. |
| nForce:
--- Quote from: ArthurDent on December 11, 2018, 06:06:29 pm ---nForce - "So if I understand correctly: When we make a short circuit on the grid, those electrons flow from a transformer through wire into ground. " No, no, no! Read what I posted. The ground (earth) is only a safety connection that the zero volt reference wire (neutral) is connected to at many points along the distribution route. If all the wires from the poles to the ground were removed the system would still function because, as I said: there is always a neutral wire that is connected to these ground rods at many poles and connected to neutral throughout the entire system without relying on ground except for safety. The electrons have no perspective, they could care less, but they are absolutely law abiding and follow ohms law to the letter. --- End quote --- I meant ground, as an earth. We are standing on the earth and touch the hot wire. |
| nForce:
--- Quote from: Shock on December 11, 2018, 06:01:36 pm ---This is where the electrons are going in a completed AC circuit. --- End quote --- Yes, so the electrons are switching between earth and the wire, and between earth and the transformer. But my point was about the earth (planet). |
| 001:
google Kirhgoff law |
| IanB:
--- Quote from: nForce on December 11, 2018, 07:12:13 pm ---I meant ground, as an earth. We are standing on the earth and touch the hot wire. --- End quote --- It's still not clear that you understand. Get a loose piece of wire and wave it around in the air. What is the voltage of the wire? Answer: it has no voltage. It is not 0 V, it is not zero, it is simply undefined. We do not know what the voltage is. If you touch it, no current will flow because there is no voltage. Now imagine the Earth as a big ball of wire floating in space. What is the voltage of the Earth? Again, we do not know. It is undefined. If you stand on the Earth no current will flow. The Earth is isolated because space is an insulator. So now, consider a transformer. It will have two wires coming out of it. Neither wire has any voltage relative to ground because the winding is isolated. Neither wire is hot, and neither wire is neutral. If you touch either wire while standing on the ground nothing will happen. Next, suppose we connect one wire to a rod in the ground. We have now made this wire neutral, and the other wire has been made hot. It wasn't hot before, but now it is. So now, what happens if we touch the hot wire? Now there is a circuit made and current can flow. The current flows through you, through the Earth (a big ball of wire), through the rod in the ground, and back to the transformer. When you say "short circuit" you need to understand that "circuit" means a closed loop, out and back again. So a "short" circuit is a shorter loop than the one intended. That's it. |
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