On Fri, 26 Jul 2002, Wouter van Ooijen wrote: >> > Here's a trivial EE question which i stumbled upon. how do >> i calculate >> > the effective resistance between pt A and B? >> >> >> Its actually a "trick" question. Method of solution has been >> pointed out by several people. The general solution (for >> randomly selected resistor values) can be solved as suggested >> by others. > >A related 'trick' question: take a wire cube, each wire has a resistance >of 1 ohm. Put a 1 Volt battery on the two diagonally opposite points on >one side. How much current does the battery supply? The trick is of >course that some wires carry zero current. I beg to differ. There are no wires that bear zero current in a cube as you describe (hint: the number of edges the current has to traverse is always uneven - equal to three). Peter -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics