Re: brightness vrs. power

[Doug Craigen <dcc@ESCAPE.CA>]

> Further, in their Instructor's Manual, they write: "In our experience,
> students who have previously studied electric circuits have almost
> always over-generalized Ohm's law, confusing it with the Kirchhoff
> loop rule.  They tend to think that V = IR is a fundamental physical
> principle rather than merely describing the approximate behavior of
> some materials (if the temperature doesn't change much)."

Is it my imagination or were "Kirchoff's rules" once known as
"Kirchoff's Laws"?  I used to think they were called laws, until I got
to that part of the text when I first taught intro physics.  Now I'm not
sure if my memory is playing tricks on me or what.

()-()-()-()-()-()-()-()-()-()-()-()-()-()-()-()

Doug Craigen
          http://www.dctech.com/physics/