Water and wind can be used to create electric power by turning a turbine containing a magnet. Adjacent to the turbine shaft, the generator contains a stationary wire. When the magnet in the turbine rotates, the electrons in the wire are pushed back and forth by the magnetic field, causing waves of alternating current (AC) in the wire. Consider the following graph, excerpted from the book series Electricity & Magnetism, available from Schottenbauer Publishing.
Discussion Questions
Is the field of a bar magnet similar to the horseshoe magnet above? Why or why not?
Is it more efficient to use a bar magnet or a horseshoe magnet in a generator? Explain.
Is it preferable in a generator to use a magnet with high magnetic field or low magnetic field? Explain.
