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



Hi Brian,

Could you please post the link - it's an area of interest to me.

Bob LaMontagne

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Brian Whatcott
Sent: Monday, May 24, 2010 12:53 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Thermal heating in a resistor?

John Clement wrote:
Why is the formula P=I^2R used to describe thermal power loss in resistor
instead of P=IV or P=V^2/R? Is this just the textbook author's choice of
formula?
-Tony
--
Tony Wayne /snip/
I have just come across an extremely likely explanation for this usage.
This is called the Joule-Lenz law or Joule's first law. /snip/
John M. Clement
I was bemused by this exchange concerning what was once widely known as
'Joule heating',
a term then used synonymously with 'I2R loss'.
Taking a google straw poll however, I see that 'ohmic heating' or 'ohmic
dissipation'
is now preferred to Joule heating (apparently) in physics contexts.
I expect it is unfair to notice that at least one physics paper in
atmospheric physics
now equates Joule heating with 'frictional heating' in referring to the
interaction of
charged winds with magnetic and electric field effects.

Brian W
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