> It seems natural to you to deal with voltage as your base since that's > how electronics is taught. Just to help add some confusion: Even ignoring anything except resistance, "pure" resistors don't exist - all have SOME dependency on current and voltage. Fortunately, the affects are small enough to be ignored for all but the most demanding applications. RM -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu