CELL THEORY
A lead-acid cell works by a simple principle: when two
different metals are immersed in an acid solution, a
chemical reaction creates an electrical pressure.
One metal is brown-colored lead dioxide (Pb02). It
has a positive electrical charge. The other metal is
gray colored sponge lead (Pb). It has a negative
electrical charge. The acid solution is a mixture of
sulfuric acid (H2SO4) and water (H20). It is called
electrolyte.
If a conductor and a load are connected between the
two metals, current will flow. This
discharging
will
continue until the metals become alike and the acid is
used up. The action can be reversed by sending
current into the cell in the opposite direction. This
charging
will continue until the cell materials are
restored to their original condition