units of measurement

Several years ago, I was asked to conduct a seminar on basic electricity for the members of a small homeowners' association.  They were working their way alphabetically through the various trade disciplines with which a homeowner might come in contact.  As I recall, they had covered attic fans, brickwork, cabinetry, carpeting, decks and doors at previous meetings.  I learned that I was to be followed in coming months by fences, fireplaces and