electron velocity - Page 3 - Electronic Circuits Projects Diagrams Free

Sceadwian · 16th March 2007, 02:58 AM

1cm a second? Where'd you come up with that random number?

Cabwood · 16th March 2007, 01:55 PM

1cm/s. Right, that's that all cleared up then. I don't suppose you happen also to know the speed of water molecules in a pipe?

**Nigel Goodwin** · 16th March 2007, 01:58 PM

I'm just really pleased I moved this silly thread to the Chit Chat forum!

luisgerman · 16th March 2007, 03:10 PM

Quote:

Originally Posted by Nigel Goodwin

I'm just really pleased I moved this silly thread to the Chit Chat forum!

After reading some of your posts I wouldn´t expect anything different from you.

The Super Moderator calling this thread a silly thread

Next think I expect from you is to throw me out of this forum

I´ll be pleased if you do so

(My last post as long as you are the moderator)

Hero999 · 16th March 2007, 03:33 PM

Quote:

Originally Posted by Moderator

This thread is silly

Quote:

Originally Posted by whinerman

:cry: I don't like what you just said. I'm leaving! :cry:

Sceadwian · 17th March 2007, 02:03 AM

As long as it's actually in the chit-chat forum now I don't feel so bad about leaving one sentance pointless replys.

NeoMach · 23rd September 2007, 11:48 PM

Current measured in amps, 1amp = 1Coulum/1sec. 1 coulum = 6.25X10^18Electrons.

crashsite · 11th December 2007, 08:46 PM

Quote:

Originally Posted by earjun

Wait before we close the discussion now the drift velocity is very small...but the moment we switch on things start working which are connected by copper wires covering long distance can someone explain this?

The usual analogy is a hose that's already full of electrons....er...water. When new water comes in one end, old water immediately comes out the other due to the interactions of the water molecules (but, not instantly. There is a propagation delay for the effect to travel through the hose). The actual water travels slowly but pressure changes propagate rapidly.

dknguyen · 13th December 2007, 01:43 AM

Quote:

Originally Posted by Keruskerfuerst

Speed of electrons in a wire: 1cm/s.

THat number sounds familiar to me. I think we came up across it in my second electromagnetics class. Except I think it was more like 2-3cm/s. I forget how we calculated it.

neon · 9th January 2008, 10:24 PM

according to einstein's laws e[v+phase ]=hc where e=electron charge =1.6x10-19 coulombs phase=work function in volts =6.6x10-34 joule/sec c=velocity of light=3x10+10 so now do your math.ephase=hc/lanbda=12000 armstrong units of course thiese are photons emissions.

Leftyretro · 10th January 2008, 02:34 AM

Eye Captain, I'm givin you all shes got, at this rate she is sure to blow at any moment.

Lefty

Analog · 10th January 2008, 02:41 AM

~4cm/s if I remember correctly

jpanhalt · 10th January 2008, 03:41 AM

See: http://hyperphysics.phy-astr.gsu.edu...ic/ohmmic.html

In brief, the citation assumes a physical model in which each atom of copper has one mobile electron. There are so many atoms in a wire with a diameter of 1 mm that the wire can pass 1 A with a very low drift velocity.

For example, the aforementioned wire has 6.62X10E20 copper atoms per lineal cm. Assuming one mobile electron per atom, that is equivalent to approximately 100 coulombs of mobile electrons per cm. Thus, a current of 10 A would have a drift velocity of only 1 mm/sec. Of course, that conclusion is dependent on the validity of the assumed number of mobile electrons per atom that are involved during conduction. John

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16th March 2007, 02:58 AM
Sceadwian Experienced Member	1cm a second? Where'd you come up with that random number? __________________ Curiosity killed the cat; That's why they have nine lives.

16th March 2007, 01:55 PM
Cabwood Experienced Member	1cm/s. Right, that's that all cleared up then. I don't suppose you happen also to know the speed of water molecules in a pipe? Last edited by Cabwood : 16th March 2007 at 01:59 PM.

16th March 2007, 01:58 PM
Nigel Goodwin Super Moderator	I'm just really pleased I moved this silly thread to the Chit Chat forum! __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

17th March 2007, 02:03 AM
Sceadwian Experienced Member	As long as it's actually in the chit-chat forum now I don't feel so bad about leaving one sentance pointless replys. __________________ Curiosity killed the cat; That's why they have nine lives.

23rd September 2007, 11:48 PM
NeoMach New Member	Current measured in amps, 1amp = 1Coulum/1sec. 1 coulum = 6.25X10^18Electrons. __________________

9th January 2008, 10:24 PM
neon Experienced Member	according to einstein's laws e[v+phase ]=hc where e=electron charge =1.6x10-19 coulombs phase=work function in volts =6.6x10-34 joule/sec c=velocity of light=3x10+10 so now do your math.ephase=hc/lanbda=12000 armstrong units of course thiese are photons emissions.

10th January 2008, 02:34 AM
Leftyretro Experienced Member	Eye Captain, I'm givin you all shes got, at this rate she is sure to blow at any moment. Lefty __________________ Measurement changes behavior

10th January 2008, 02:41 AM
Analog Experienced Member	~4cm/s if I remember correctly __________________ "Everything that is done in the world is done by hope." -Martin Luther "There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."-Albert Einstein

10th January 2008, 03:41 AM
jpanhalt Experienced Member	See: http://hyperphysics.phy-astr.gsu.edu...ic/ohmmic.html In brief, the citation assumes a physical model in which each atom of copper has one mobile electron. There are so many atoms in a wire with a diameter of 1 mm that the wire can pass 1 A with a very low drift velocity. For example, the aforementioned wire has 6.62X10E20 copper atoms per lineal cm. Assuming one mobile electron per atom, that is equivalent to approximately 100 coulombs of mobile electrons per cm. Thus, a current of 10 A would have a drift velocity of only 1 mm/sec. Of course, that conclusion is dependent on the validity of the assumed number of mobile electrons per atom that are involved during conduction. John