Electron velocity question
 

Given a certain potential (voltage) applied to an electron, how do you find it's velocity knowing it's charge?

Help me do my homework.

Re: Electron velocity question
 

1 Volt = 1 Joule/Coulomb so an electron falling through a potential of 1 Volt will pick up kinetic energy of 1 Joule per Coulomb:

Ek=1/2*me*v^2= qe*V

me and qe are electron mass and charge.
V is potential difference.
v is velocity.

E&M kicks ass.

Good luck...
Randy

Re: Electron velocity question
 

ding.


that is if the entire potential energy goes into kinetic though. you could also find the coulomb force and calculate the acceleration so you could then use kinematics to solve for v(t).

Re: Electron velocity question
 

It is pathetic how little of my applied physics education I remember. Magic: the Gathering turned me into a useless gamer.

Re: Electron velocity question
 

[ QUOTE ]
you could also find the coulomb force and calculate the acceleration so you could then use kinematics to solve for v(t).

[/ QUOTE ]

Bonus points if you then tell me precisely where the electron is.

~D

Re: Electron velocity question
 

booooooooo [img]/images/graemlins/laugh.gif[/img]

Re: Electron velocity question
 

I'm suprised nobody has talked about electron drift which is totally different than electron speed. I would think that most people would easily reverse the two.

FYI, for a copper wire of radius of 1 mm carrying a current of 10 Amps, the drift velocity (velocity the electron travels down the wire) is only a very slow 0.024 cm/sec.

That same electron is traveling about c/3 around the copper atoms though.

Re: Electron velocity question
 

do you ever make a post that does not draw attention to the fact that you are an engineering student?

Re: Electron velocity question
 

</font><blockquote><font class="small">In risposta di:</font><hr />
I'm suprised nobody has talked about electron drift which is totally different than electron speed. I would think that most people would easily reverse the two.

FYI, for a copper wire of radius of 1 mm carrying a current of 10 Amps, the drift velocity (velocity the electron travels down the wire) is only a very slow 0.024 cm/sec.

That same electron is traveling about c/3 around the copper atoms though.

[/ QUOTE ]


bah, nobody who's anybody confuses drift velocity with velocity.

Re: Electron velocity question
 

[ QUOTE ]
[ QUOTE ]
I'm suprised nobody has talked about electron drift which is totally different than electron speed. I would think that most people would easily reverse the two.

FYI, for a copper wire of radius of 1 mm carrying a current of 10 Amps, the drift velocity (velocity the electron travels down the wire) is only a very slow 0.024 cm/sec.

That same electron is traveling about c/3 around the copper atoms though.

[/ QUOTE ]


bah, nobody who's anybody confuses drift velocity with velocity.

[/ QUOTE ]

Word. Drift only occurs in a conductive medium and given the basic nature of the original question I'm pretty confident we're working in a vacuum here.

Keep It Simple Stupid

R.

Re: Electron velocity question
 

Are we all smart now? Okay, let's move on.

Re: Electron velocity question
 

[ QUOTE ]
bah, nobody who's anybody confuses drift velocity with velocity.

[/ QUOTE ]

Hey that's not true, they are the people who pay your bills.

[img]/images/graemlins/grin.gif[/img]

Re: Electron velocity question
 

[ QUOTE ]
[ QUOTE ]
you could also find the coulomb force and calculate the acceleration so you could then use kinematics to solve for v(t).

[/ QUOTE ]

Bonus points if you then tell me precisely where the electron is.

~D

[/ QUOTE ]

no one knows precisely because of the "uncertainty theory"
i think it says you can only know where an electron "was", because you cant know both speed and position, only one or the other (quantum leaps?).

Re: Electron velocity question
 

You need to learn how to read more carefully.
Linky