1. The problem statement, all variables and given/known data Hey guys........I'm helping my girlfriend again, in her intro physics. We never went over this stuff, in my more advance physics. Her question is this: What would a speaker do the instant a low-voltage battery is connected to it? 2. Relevant equations 3. The attempt at a solution I am not sure......I'm guessing that it would make a humming noise....but that is just a guess. She can't find it in her book, and I'm not there to look at it. Any way of explaining it to me, so I can try to teach it to her(she needs to actually know "why"....not just the answer). Thanks! Brad PS....she just typed to me, and she thinks that it just "won't work"......so, if that is the answer....haha.....just say. ***Edit....Typed more to me.....She thinks it won't work, due to it being a low power source, and a DC current. This makes sense to me......but then I think about car speakers, but I think they are ran through a converter/booster.