i think i may have the solution to this problem, but something about it is still bothering me. the question is, if you have a 100W and a 60W bulb, both on the same series circuit, across which bulb will there be a greater voltage drop? if the same are on a parallel circuit?.. as i understand voltage drop, it is proprtional to resistance. so, Watts = amperes x volts or watts = (volts / ohms) x volts then solve for resistance. but how would these be any different on a series or parallel? :grumpy: i'll admit right now that i am more than a little confused as to what voltage drop really is. :grumpy: please clarify!!any help would be greatly apreciated!