[sdiy] Weird tubular, grey (sometimes blue) resistors

[Ian Fritz]

At 03:38 PM 11/13/2007, Tim Parkhurst wrote:

>I was thinking more along the lines of "Daraf." However, I can't for
>the life of me figure out where such a property (the inverse of
>capacitance) would be useful. I can see cases where you want the
>capacitance to be as low as possible, but that's not the same as an
>inverse property.

Capacitive reactance -- the AC resistance of a capacitor -- is 1/2*pi*f*C, 
so 1/C is definitely important for AC circuit analysis. (Think filter theory.)

Another example is C-V analysis of semiconductor junctions, which relies on 
plots of 1/C^2 vs bias voltage.

Hope this helps.

   Ian