Author Topic: Current And Electron Motion  (Read 2966 times)

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Offline SionynTopic starter

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Current And Electron Motion
« on: November 13, 2012, 10:01:41 pm »
http://amasci.com/miscon/speed.html

"electricity" is not a defined quantity (try to look it up).  the mean drift speed of electrons is around 1mm/s but the speed that the effect of turning on the supply will propagate at not far short of the speed of light.

never the less quite interesting article

The way I think is the more voltage is applied the more electrons' speed increase because higher voltage = more energy = more speed
I think an higher energy object can be more speed than a low energy one but in the drift velocity formula only appears the current not the voltage

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Offline Gall

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Re: Current And Electron Motion
« Reply #1 on: November 14, 2012, 01:03:53 pm »
It gets even more interesting if you remember that the electron is not a rigid sphere.

The electron in a metal wire is delocalized. That is, its wave function looks much like the oscillation everywhere in the wire. The current changes the shape of wave functions.
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Offline Mechatrommer

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Re: Current And Electron Motion
« Reply #2 on: November 14, 2012, 01:21:24 pm »
the electron is not a rigid sphere.
nothing is rigid. everythings are made of electromagnetic waves.
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« Last Edit: November 14, 2012, 01:24:09 pm by Mechatrommer »
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Offline Blofeld

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Re: Current And Electron Motion
« Reply #3 on: November 14, 2012, 04:36:31 pm »
http://amasci.com/miscon/speed.html

"electricity" is not a defined quantity (try to look it up).  the mean drift speed of electrons is around 1mm/s but the speed that the effect of turning on the supply will propagate at not far short of the speed of light.

never the less quite interesting article

The way I think is the more voltage is applied the more electrons' speed increase because higher voltage = more energy = more speed
I think an higher energy object can be more speed than a low energy one but in the drift velocity formula only appears the current not the voltage

But the current is proportional to the voltage. Or would be if we were talking about a linear resistor. The example is about a light bulb, which makes things more complicated - the resistance of the light bulb goes up with the temperature.
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Offline Gall

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Re: Current And Electron Motion
« Reply #4 on: November 14, 2012, 05:45:24 pm »
nothing is rigid. everythings are made of electromagnetic waves.
Not exactly, nuclear forces are not electromagnetic. Leptons aren't electromagnetic waves.
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Offline Mechatrommer

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Re: Current And Electron Motion
« Reply #5 on: November 14, 2012, 06:49:04 pm »
but certainly not rigid aka solid. i mean nothing is purely rigid not what you thought you see it is.
Nature: Evolution and the Illusion of Randomness (Stephen L. Talbott): Its now indisputable that... organisms “expertise” contextualizes its genome, and its nonsense to say that these powers are under the control of the genome being contextualized - Barbara McClintock
 

Offline Gall

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Re: Current And Electron Motion
« Reply #6 on: November 15, 2012, 08:12:23 am »
Sure. The classical definition of current is the charge going through a intersection of the wire in a certain time. The charge is usually counted as number of electrons times charge of one electron. But this is only true if the electron is considered to be a point or a small symmetrical object like a sphere. The quantum definition is more complex and requires integration of wave function because there is no such thing as "electron position".
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