Confused dude, and by orders of magnitude, dude

[Paul Perry]

At 06:07 AM 30/03/99 EST, you wrote:

>When entering capacitor values into formulas which call for values of R and C,
>are basic "C" units expressed as microfarads or farads? 

Farads.

 For example, when
>solving for cutoff frequency in a classic 3-opamp state-variable filter, the
>formula is given as:
>
>                  1
>Fc = _____________
>          2 * pi * R * C   
>
>Obviously, R is expressed in Ohms, but is C expressed as Farads or
>Microfarads? 

Farads, still.


 That is to say, if my chosen cap value is 0.1uf, should I enter
>C as 0.1, or should I enter it as 0.00000000000001 ?

Neither. 0.0000001.
Because, a microfarad is one-millionith of a farad.

>Also, it is assumed that all formulas requiring a C value will adhere to this
>definition of C?

Yes.

paul perry Frostwave P/l Melbourne Australia.

BTW, I use & recommend Horowitz and Hill, "The Art of Electronics" second
edition.
Try for a secondhand copy .. but who would ever part with one?

BTW, the capacitance between the earth and moon is......? (more than you think)