Get a cheap multimeter and measure which is positive. If you really want to not spend the money, then get a 9 volt battery, and connect it in series with the charger. If you end up getting more voltage than the negative of the battery is connected to the positive of the charger, and if you end up getting a lot less voltage, then the negative of the battery is connected to the negative of the charger.
Marshall sol wrote: > Sorry all for this very dumb question, but I was playing around and > put together another generator. The power supply is a phone charger, > 9V 450 ma. For experimental purposes I used tap water, Connecting > what I thought was the positive power lead to the electrode I chose to > be the positive one, tons of bubbles immediately started coming off > that electrode. Is this indeed the positive power lead then? I know > I've read this before but can't find it. For this power supply both > wires are black so I have no color coded wires to guide > me..........once I determine the positive lead, I'll mark it with red > nail polish........so I won't get confused again. Pls nobody think I > plan to actually make CS with tap water, this was just an experiment > to "see" the process, and find out which lead is the positive > one. TIA,paula
