A battery doesn't work if you connect it negative to negative correct? It's not a proper circuit. Well, in Physics today we we making circuits blah blah, and instead of using a power supply today, we just used something of a battery pack (not sure exactly what it's called, but you put in some batteries , and the thing that you put them in has two wires that come out of a different part of the "pack", which I assume are connected to something else. I haven't seen inside it so I'm not sure). Well, point being is that if I connect those two wires to a Volt meter or Ammeter or whatnot, it doesn't matter what wire I connect to the positive terminal of the Ammeter. Why? Is it just because that I'm connecting a wire to the Ammeter? If I somehow connected the negative side of a battery to the ammeter, then the positive terminal of the Ammeter to a resistor, and then the resistor to the positive side of a battery, would it work?? Basically, I'm wondering how come I can't connect a battery negative to negative, but when I connected the wires to the Ammeter I didn't have to worry about negative/positive... P.S sorry that it's worded really badly, I don't really know how to describe the "battery pack".