Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

This question is For all

Status
Not open for further replies.

Davood Amerion

Advanced Member level 2
Joined
Mar 1, 2005
Messages
584
Helped
116
Reputation
232
Reaction score
24
Trophy points
1,298
Location
Persia
Activity points
6,351
current flow in closed loop!
it is circulated from (eg) positive terminal to circuit and then ground and then power source and again in positive terminal.
 

nikhilele

Advanced Member level 3
Joined
Jan 11, 2006
Messages
805
Helped
101
Reputation
202
Reaction score
76
Trophy points
1,308
Location
Bangalore India
Activity points
6,375
sorry davood i am not so clear about my question, i just forget what i wanna ask, i am very sorry, i will ask the question later.
 

IanP

Advanced Member level 5
Joined
Oct 5, 2004
Messages
7,942
Helped
2,309
Reputation
4,620
Reaction score
531
Trophy points
1,393
Location
West Coast
Activity points
66,459
Mains = Active - Neutral - Earth
Lets split answer into two:

- current from Active through a load and Neutral travels back to the nearest step-down mains transformer, where the loop is closed; if not for that transformer it would go back to the power generator ..

- Earth/Ground; in ideal situations no current should flow through the Earth wire; it is provided only for safety reasons and is connected to the local Earth just outside of your building, quite often connected to a copper rod hammered into ground and/or watter supply pipeline ..
The above arrangement may vary from country to country and depends on the local regulations ..

Regards,
IanP
 

rituparnasaikia

Member level 3
Joined
Feb 1, 2006
Messages
57
Helped
3
Reputation
6
Reaction score
0
Trophy points
1,286
Location
Bangalore, India
Activity points
1,696
Flow of holes are nothing but the direction a current. What will happen if a electron is placed on hole? thats the answer
 

ptmsl

Full Member level 1
Joined
Aug 1, 2005
Messages
99
Helped
16
Reputation
32
Reaction score
5
Trophy points
1,288
Activity points
2,643
Good question. Neutral is connected to "earth" at the power station for safety reasons. The power system is not isolated from earth but there is a very solid earthing (grounding) at the power station. Also ground is connected to earth outside your building. So the loop is closed between one end- the "live"or "mains" of the power generator at the power station (or the high/medium voltage transformer of the power company that also has its neutral connected to earth), the cabling to your house, the leak, the grounding scheme at your building and the grounding arrangement at the power company connected to the other end of the generator (or transformer) named neutral.
Of course this is simplified because 3-phase power is used but still neutral is earthed by the company. Many years ago neutral was also connected to earth at each house but this scheme has been abandoned and is against the regulations of most countries.
 

vicky

Full Member level 4
Joined
Aug 11, 2004
Messages
237
Helped
22
Reputation
44
Reaction score
4
Trophy points
1,298
Activity points
2,404
the groung or the earth goes in earth and disperse therwe make the proper grounding with making a metal plate connected to the earh connection and then works
 

jonw0224

Full Member level 4
Joined
Nov 22, 2004
Messages
211
Helped
45
Reputation
90
Reaction score
14
Trophy points
1,298
Location
USA
Activity points
2,528
There is normally some ground current through the ground electrode at the neutral main. The current is much smaller than the neutral current. The neutral provides a very low impedance path back to the generator, however the ground provides another high impedance path back to the generator. Ultimately, the current provided by the generator must flow back, but electrons don't care much about the path and will take every path back to the generator in proportion to the admittance of that path.

The purpose of the ground electrode is simply to remove the step potiential between the neutral and the ground near the ground electrode. Without the ground electrode, you cannot guarrantee the potiential of the neutral is at zero volts relative to ground.

The ground potiential actually varies from place to place. Large ground currents have been recorded in the crust of the earth. The magnetic field of the earth itself can be explained by large currents in the earth (most people think in the core and mantle). Basically, however, this is a hypothesis and no one really knows the entire nature of the magnetic field or the currents in the earth. I read an article that earthquakes may be detected by measuring ground current and potiential (in reference to what?) and radiation due to corona discharge from the ground to the air.

Anyway, I ramble because I have more questions than answers but perhaps this helps some: for every amp that leaves one terminal on the generator, an amp must enter the other terminal and current flow through the surroundings is dictated by the resistance of paths between the terminals (some electrons even wander the gap through the air from one terminal to the other, however, these would be rare indeed).
 

Naveed Alam

Full Member level 5
Joined
Jan 6, 2006
Messages
287
Helped
16
Reputation
34
Reaction score
3
Trophy points
1,298
Activity points
3,250
nikhilele said:
Where the current from the ground goes?
it goes no-where...strange huh...!!!
i explain it..
the ground terminal or the neutral, the positive terminal..all these are used to produce thrust to move electron..and when electron moves, current is produced.. so, the kinetic energy of electron is shaped into electronic current..
as i said current goes nowhere..because the electron remnains within conductor, it don't leave it..
rememeber that that the actual flow is from Ground(or neutral) to the positive terminal..we use convention that the current flows from positive terminal to Ground(or neutral)

i think it will clear ur question

Regards
 

sherlock

Newbie level 3
Joined
Feb 7, 2006
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,342
In North America standard "mains" power was two-wire (hot and neutral) in many places. Within the last 50 years, the standard has gone to 3 wires, hot, neutral, and ground. The reason was mainly for safety. The replies before correctly state that any current flows between the hot, through the load, to the neutral, and then the reverse, mains being AC power. Since many machines include electric motors, to prevent shock from these machines the machine frames are connected to the ground wire in the mains circuit. If the motor winding shorts to the frame, for example, theoretically any current will flow through the ground wire and not through any person who happens to be touching it. You'll probably notice that most power tool bodies today are made from plastic and not metal as in the past. In addition to being more economical, the plastic bodies insulate the user from the power line. Whereas any device that has a metal housing is required to have a 3-wire grounded plug, plastic-housed devices are not, and commonly use a 2-wire plug. So if the power circuit and load are functioning properly, there should be no current flow through the ground wire.
 

JoseLeonardo

Full Member level 1
Joined
Aug 9, 2004
Messages
96
Helped
4
Reputation
8
Reaction score
1
Trophy points
1,288
Activity points
767
the current flow in close loop, it don't go anywhere.
 

sp

Full Member level 6
Joined
Jan 1, 2004
Messages
396
Helped
23
Reputation
46
Reaction score
2
Trophy points
1,298
Location
Floating Garden
Activity points
4,046
so many expert answers tht make the poor guy forgot his wad question he wanna ask....

to me.. the "ground" is the reference point in circuits and it is the path where the currents flow back to the source....

sp
 

ArjunSC

Member level 1
Joined
Dec 24, 2005
Messages
40
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,286
Activity points
1,669
The Current gets a closed loop in the ground ........and whenever there is a closed loop shall the current be able to flow..........The direction of the flow depends on the voltage difference...........the current always flows from a high voltage point to a low voltage point !!!...........(remember diffusion )
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top