Why was the akosombo dam built?

The Akosombo dam produces H.E.P (Hydro Electric Power). It does so by the water coming from the reservoir (Lake Volta) goes into the dam which spins a turbine as it goes through, this then spins a generator. The generator has a stator and a rotor. The turbine spins the rotor which is a magnet and around the edge is the stator. The stator contains a metal (usually copper) which spins 1000's of times a minute creating Hydro Electricity.