During a chemistry class where we were doing batteries by inserting metals into acid to light a small light bulb, i theorized that since the voltage depended on

During a chemistry class where we were doing batteries by inserting metals into acid to light a small light bulb, i theorized that since the voltage depended on the area of contact with the metal, then using steel wool would make mads voltage. it did not work at first (maybe i had anything that would start a current with steel, don't really remember the details, or any chemistry from high school) but eventually i got some current (maybe some of the previous metal rod was still in the solution?). the light bulb wasn't burning brighter then before, but the part of the steel wool that was out of the acid sure was. burning metal in a cup of acid. and no eye protection.