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Re: A Simple Lab Demo of Resistor Noise EMF.



This is called the "taut wire" ammeter. A stretched wire, with attached
pointer, carried the current. The wire changed length in response to I^2R
heating.

Bob Sciamanda
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor
----- Original Message -----
From: "brian whatcott" <inet@INTELLISYS.NET>
To: <PHYS-L@lists.nau.edu>
Sent: Tuesday, March 20, 2001 08:08 PM
Subject: Re: A Simple Lab Demo of Resistor Noise EMF.
. . .
There was another instrument in the same general class:
the hot wire ammeter relied on the sag caused by current
through a fine wire to provide a pointer deflection.
It was indifferent to the current direction.
brian whatcott <inet@intellisys.net> Altus OK
Eureka!