Mark Wieczorek

Mark,
The legend on the first chart in section 2. should be labled billions not millions.
Cheers,
Gary

On page:
http://www.marktaw.com/recording/Electronics/OhmsAmpsandSpeakers.html

You say that you don't know if the formulas for calculating ohms on parallel wiring are the same. Well, they are.
Quick poorf:
a and b are some real numbers.
(a * b) : (a + b)
<=> 1 : (1 : ((a * b) : (a + b)))
<=> 1 : ((a + b) : (a * b))
<=> 1 : ( a : (a * b) + b : (a * b) )
<=> 1 : ( 1 : b + 1 : a )

Alternatively you can think of it with negative exponentes:
<=> (((a * b) : (a + b))^-1)^-1
<=> ((a + b) : (a * b))^-1
<=> ( a : (a * b) + b : (a * b) )^-1
<=> (b^-1 + a^-1)^-1

Well, it's a bit clumsy to represent math with ASCII, but I suppose one should be able to understand those. Just to make it absolutely clear:
* is multiplication
: is division
and <=> is equivalence