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But their drift velocity will increase only with an increase in E field
strength in the copper which depends on the potential difference applied
to the wire. An effective PD of 120 volts will create a constant
effective drift velocity. So I say again, the amount of energy you
derive from the power line depends on the number of electrons that are
vibrating.
poj
Brian Whatcott wrote:
>Actually not.
>
>The way that the number of electrons increases across some plane
> [in some time increment] is by increasing their drift velocity - in my
>(always considered) view.
>I take it that the number of mobile charge carriers in the usual course
>of events is a function of the material, its state, and its cumulative
>volume for any reasonable electric field strength - i.e reasonably
>constant.
>
>Brian
>
>At 01:34 PM 5/9/02, you wrote:
>
>>Imagine a swarm of electrons vibrating in a copper wire, Brian. There are
>>two ways that the number of electrons passing a given reference plane in a
>>half cycle can increase: either the number of electrons in the swarm
>>increases or the wavelength of the vibration increases. Since the
vibrationn
>>frequency remains fixed at 60 Hz, the wavelength of a vibration also stays
>>fixed. Therefore, the number of electrons vibrating must increase.
>>
>>poj
>>
>>----- Original Message -----
>>From: "Brian Whatcott" <inet@INTELLISYS.NET>
>>To: <PHYS-L@lists.nau.edu>
>>Sent: Thursday, May 09, 2002 11:44 AM
>>Subject: Re: reifying energy
>>
>>
>>>It is either a discussion gambit or a nit-pick I realise,
>>>but the number of electrons that vibrate is not material,
>>>but rather the number of electrons that pass a reference
>>>plane.
>>>
>>>Brian
>>>
>>>
>>>At 08:32 AM 5/9/02, you wrote:
>>>
>>>>I think we're paying for (1) the potential difference that the utility
>>>>company maintains across the wires at our meter
>>>> (same price for everyone)
>>>>and (2) the number of electrons residing in our household wiring that
>>>>vibrate back and forth at 60 Hz (price depends on number of electrons
>>>> made to vibrate by the loads we switch on).
>>>>
>>>>poj
>>>>