Confused dude, and by orders of magnitude, dude

[jh]

>Obviously, R is expressed in Ohms, but is C expressed as Farads or
>Microfarads?  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 ?

Depends on what you expect to get for frequency (;->).
Millihertz ? Gigahertz ?

Normally an equation like this works with Farads, Ohms and so on, so yes,
fill in C as 0.1e-6 and get the result in Hz.


There is another kind of equations where the variables as well as the results
are scaled; you will find it in the form 

Equation; [kHz, kOhm, uF] 

where the information in the brackets tells you what scaling to use.

This was handy when people didn't have pocket calculators, but it's
an anachronism today.

The *worst* thing you can find is an equation of this second style,
but without the information in brackets. People who are working
on one single topic their whole lives are tempted to do that. It can be 
a pain if you  try to read books on magnetism or on financial 
calculations for instance.

But normally go with unscaled values and be happy.

JH.