Battery - A combination of two or more cells electrically connected to work together to produce electrical energy.
Circuit - An electrical system that provides a path for electrical current to flow.
Electricity - Energy made available by the flow of electrical charge through a conductor
Current - The flow of electricity.
Electrons - A negatively charged component of an atom. Electrons exist outside of and surrounding the atoms nucleus.
Compass - A navigational instrument for determining direction relative to the Earth's magnetic poles.
Magnet - A piece of iron, nickel, cobalt, or steel that produces a magnetic field.
Electromagnet - A temporary magnet made by coiling wire around an iron core. When current flows in the coil the iron becomes a magnet.
Attract - When two or more magnetic materials are pulled towards each other due to the forces between opposing poles.
Repel - When two or more magnetic materials are pushed away from each other due to the forces between similar poles.
While older historical references often count eight main dams (because Maraetai has two powerhouses and Horahora is now submerged under Lake Karāpiro), the modern system consists of 9 distinct hydro plants:
Ohakuri (Ōhākurī)
Atiamuri (Ātiamuri)
Maraetai I and Maraetai II (counted as two stations)
Waipapa (Waipāpa)
Karapiro (Karāpiro)
Note: The Huntly Power Station also sits on the lower Waikato River at Huntly, but it is a thermal/coal-and-gas power station rather than part of the hydro scheme.