So in eco number one and half cell number one, this red bar corresponds to our zinc solid. So zinc solid releases two electrons and it also releases our zinc ion. Now, this zinc ion is released into our solution from our metal bar. So the solution that has water as solvent increases in its concentration of zinc ion and at the same time, it increases the positive charge found within our solution in beaker one in half cell number one. Now, these electrons travel through the conductor and across and into the other side. Now, as it travels from this side to this side, this light bulb lights up.