Re: [Phys-l] Thermal heating in a resistor?

[Brian Whatcott <betwys1@sbcglobal.net>]

For me, it's a stretch to label ion impacts in neutral tropo winds, as a
Joule Heating issue. The model he was presumably using was the idea of 
bulk acceleration/momentum transfer to the wind by ionic impact.

B

Bernard Cleyet wrote:
> Well,   he did "frictionally" heat water using paddles driven by a falling weight, n'est-ce pas?
>
>
> bc brought up on Joule (I^2R)heating
>
>
> In 1845, Joule read his paper On the mechanical equivalent of heat to the British Association meeting in Cambridge.[12] In this work, he reported his best-known experiment, involving the use of a falling weight to spin a paddle-wheel in an insulated barrel of water, whose increased temperature he measured. He now estimated a mechanical equivalent of 819 ft·lbf/Btu (4.41 J/cal).
> In 1850, Joule published a refined measurement of 772.692 ft·lbf/Btu (4.159 J/cal), closer to twentieth century estimates.[13]
> [edit]
>
> http://en.wikipedia.org/wiki/James_Prescott_Joule
>
>
> On 2010, May 24, , at 09:52, Brian Whatcott wrote:
>
>   
> > now equates Joule heating with 'frictional heating' in referring to the 
> > interaction of
> > charged winds with magnetic and electric field effects.
> >
> > Brian W
> >