Professor Dave Explains
Electrochemistry
How does a battery work? Now that you think about it, you have no idea, do you? Well take a gander! Turns out it's just redox chemistry.
Khan Academy
Khan Academy: Concentration Cell
Concentration cells are galvanic (or voltaic) cells made of two half-cells, each of which contains the same electrodes, but different concentrations. Concentration cells work to establish equilibrium by transferring electrons from the...