A great video with all the build ups,basic theorys are not left as if they are understood which is very very important. One thing though, The ground wire, is not mentioned here, the 0.001 ohm, path way is understood to be the ground wire going from the equipment body directly to the grounded side( lower, neutral) wire and bonded at the main ckt board.
A great video with all the build ups,basic theorys are not left as if they are understood which is very very important. One thing though, The ground wire, is not mentioned here, which is the the 0.001 ohm return path to source at the main ckt board, there it is bonded to the neutral, necessitating, a 3rd wire called ground wire, for the fault to have a least resistence path way back to the source.
That means CURRENT has to return back to the same battery where it's coming from. It cannot flow to the other group terminal of another battery even if it's if the same voltage.
But how does the ground wire connect to the circuit when it is initially not connected? I mean if there is a loose wire and the live wire is accidentally connected to non-current carrying metal parts then there is a connection between the live wire and ground and it will draw too much current but CB will cut it off immediately. But, if there is no loose, and you accidentally touch the live wire, since there is a grounding system current still flows from the live wire to you and then the ground. I can't think of any situation where the ground wire and you will simultaneously connect to the live wire, and you can't connect the ground initially to the live wire since the breaker will immediately trip. So how can the ground wire protect you from shock? Or just it is installed with some devices that also connects the ground when you touch the live wire This question keeps haunting me
The ground wire is just like you said. It trips the cb. It doesn’t use the earth even. It’s basically a spare neutral wire that goes back to panel. It only carries current when hot touches something like equipment case. They ground the neutral side near the panel with a ground rod to prevent static voltage from building up in the system and to dissipate lightning. Again the tethering to earth is for those separate reasons. The “ground path” is really just a backup neutral. It is one with the neutral (bonded) in the panel before either see a connection to earth grounding rod. If a fault occurs through the equipment ground and doesn’t trip the breaker… the design failed.
I love ur videos and they actually educated me and changed me for the better but just when I thought I had it figured out then this video confused me so bad because I thought voltage stayed the same I’m parallel circuits and if someone touched the metallic box then it seems that they would be in parallel and voltages the same on the person that touched it so I hope u explain somday
10:09 i fail to understand why current will not flow id we just touch the hot wire and are grounded. I would assume that if we are coonected to ground there is a voltage difference between hot and ground and electricity should flow through us to ground as if that wrere a close circuit. But the explanation makes ir sound obvious that electricty canno flow unless the main circuit closes, closing with ground is not a viable option? But the video was so helpful. The final part of the parallel circuit where the path to ground is so low resistence that it saves the day was really good.
The current needs to go back to the source, but if its not connected to ground, it can not return there, so there will be no current to flow, so no shock.
because there isnt a path for current to return to the source. If there is no path, current will not flow. If you connect the source to the ground like he did at 11:58, by touching the live wire, there is now a complete path. Current flow out from the source, through you, across the soil/dirt, and back up to the source. So yes, the ground is a conductor itself. You can look up SWER (single wire earth return) where they literally use the ground as a return path to the source. So instead of using 2 wires, they only need to use 1 wire saving money on conductors. However, this system is not very common because it's not safe but it's still being used in some rural area.
@Bob One thing is confusing though , you showed us that least resistant path is .001 Ohms but as you can see the electricity has too travel towards the source and ground is not copper wires, so you speak that there is back pressure when there is resistance.i mean .001ohms has the least resistance but after that it still need to flow and complete the circuit please explain it
@@inamaman9891 Good question. To me, it's almost like the Earth is acting like one giant capacitor that can absorb a lot of energy and still not be full. Or like a reservoir for current to flow into. Think of how lighting works, and you'll see a similar reaction to that of earth or chassis ground.
Many other videos from you are good but this one, i couldn't watch after several minutes. You repeat almost the same thing many times without getting to the point... or I didn't understand....and i quit after 7-8 minutes... intended as a constructive comment. I watch some of your other videos too which are good.
A great video with all the build ups,basic theorys are not left as if they are understood which is very very important. One thing though, The ground wire, is not mentioned here, the 0.001 ohm, path way is understood to be the ground wire going from the equipment body directly to the grounded side( lower, neutral) wire and bonded at the main ckt board.
very good explanation!
A great video with all the build ups,basic theorys are not left as if they are understood which is very very important. One thing though, The ground wire, is not mentioned here, which is the the 0.001 ohm return path to source at the main ckt board, there it is bonded to the neutral, necessitating, a 3rd wire called ground wire, for the fault to have a least resistence path way back to the source.
This video is very helpful to a lot of people to understand the grounding circuit concept and I am sure will save their levies. Thank you
That means CURRENT has to return back to the same battery where it's coming from.
It cannot flow to the other group terminal of another battery even if it's if the same voltage.
look like it works that way. Why?. Maybe he should make another video explaining it.
I learnt so much Sir! thank you so much for these priceless, literally, videos.
Nicely explained (as always). However, if grounding is considered adequate, why are GFCIs needed?
You are a great teacher thanks
But how does the ground wire connect to the circuit when it is initially not connected? I mean if there is a loose wire and the live wire is accidentally connected to non-current carrying metal parts then there is a connection between the live wire and ground and it will draw too much current but CB will cut it off immediately. But, if there is no loose, and you accidentally touch the live wire, since there is a grounding system current still flows from the live wire to you and then the ground. I can't think of any situation where the ground wire and you will simultaneously connect to the live wire, and you can't connect the ground initially to the live wire since the breaker will immediately trip. So how can the ground wire protect you from shock? Or just it is installed with some devices that also connects the ground when you touch the live wire This question keeps haunting me
The ground wire is just like you said. It trips the cb. It doesn’t use the earth even. It’s basically a spare neutral wire that goes back to panel. It only carries current when hot touches something like equipment case. They ground the neutral side near the panel with a ground rod to prevent static voltage from building up in the system and to dissipate lightning. Again the tethering to earth is for those separate reasons. The “ground path” is really just a backup neutral. It is one with the neutral (bonded) in the panel before either see a connection to earth grounding rod. If a fault occurs through the equipment ground and doesn’t trip the breaker… the design failed.
Bob is the best!
Best explanation I found on UA-cam!!!
I love ur videos and they actually educated me and changed me for the better but just when I thought I had it figured out then this video confused me so bad because I thought voltage stayed the same I’m parallel circuits and if someone touched the metallic box then it seems that they would be in parallel and voltages the same on the person that touched it so I hope u explain somday
10:09 i fail to understand why current will not flow id we just touch the hot wire and are grounded. I would assume that if we are coonected to ground there is a voltage difference between hot and ground and electricity should flow through us to ground as if that wrere a close circuit. But the explanation makes ir sound obvious that electricty canno flow unless the main circuit closes, closing with ground is not a viable option? But the video was so helpful. The final part of the parallel circuit where the path to ground is so low resistence that it saves the day was really good.
The current needs to go back to the source, but if its not connected to ground, it can not return there, so there will be no current to flow, so no shock.
@@Aero_Silktail Ok. In short the ground itself behaves like a wire back to the voltage source and nothing more... correct?
because there isnt a path for current to return to the source. If there is no path, current will not flow. If you connect the source to the ground like he did at 11:58, by touching the live wire, there is now a complete path. Current flow out from the source, through you, across the soil/dirt, and back up to the source. So yes, the ground is a conductor itself. You can look up SWER (single wire earth return) where they literally use the ground as a return path to the source. So instead of using 2 wires, they only need to use 1 wire saving money on conductors. However, this system is not very common because it's not safe but it's still being used in some rural area.
The best teacher by far....Great job bob.i am waiting for IT classes soon please
@Bob One thing is confusing though , you showed us that least resistant path is .001 Ohms but as you can see the electricity has too travel towards the source and ground is not copper wires, so you speak that there is back pressure when there is resistance.i mean .001ohms has the least resistance but after that it still need to flow and complete the circuit please explain it
@@inamaman9891 Good question. To me, it's almost like the Earth is acting like one giant capacitor that can absorb a lot of energy and still not be full. Or like a reservoir for current to flow into. Think of how lighting works, and you'll see a similar reaction to that of earth or chassis ground.
Many other videos from you are good but this one, i couldn't watch after several minutes. You repeat almost the same thing many times without getting to the point... or I didn't understand....and i quit after 7-8 minutes... intended as a constructive comment. I watch some of your other videos too which are good.