How to build a hydroelectricity model?
Get a tank or some kind of water container that has two levels, the higher level will contain the turbine. Make sure the water covers your turbine. The turbine needs to be attached to a generator which can be an electric motor attached to a rechargeable battery. Water from the elevated source i s allowed to flow past the turbine, you could make a water wheel to show this working.
Look at these ideas: http://funadvice.com/r/biju9f1lkil
give the structure of hydroelectricity