"Sofie" wrote in message
...
Sir Charles W. Shults III:
That is a good in depth, overly complicated, answer but not the one I was
looking for..... obviously since the Tim Williams posting said ".And
besides that, it measures actual in-circuit conditions, because a resistor
is *supposed* to get hot, at least if it's doing its job..."

Thanks, I think.
Well, for most applications, the variation does not really matter. But
"overly complicated" is a relative thing. Without all those steps and facts,
you can't really derive an answer at all. That is, unless somebody has made a
chart like a nomograph where you pick out the resistor type and go to a table,
start at the room temperature, drop a ruler across to a power value, and derive
the reading from a scale.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip