Re: What is the layperson's way to figure out circuit math?

Mary,

You need to go to a library or an electronics hobby store and get a book on 
basic dc electronics.  You will find all of the formulas that you need, 
presented in a way that the layperson can understand.  You may be able to do a 
search on the world wide web and find the formulas that you need.

As far as your other question is concerned: power (p) = voltage (v) x current 
(i).  Also, voltage (v) = current (i) x resistance (r).  These are the basic 
formulas for electronics, you need to understand these first, then move on to 
the other formulas.