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?How a Generator
Makes Electricity
A generator changes one type of energy—the energy of
movement—into another type: electrical energy. A generator
takes advantage of a few basic facts about magnets and
magnetism. If you put a piece of iron (or certain other
substances) near a magnet, a force will pull the iron to
the magnet. The area around the magnet in which this
force acts is called a magnetic fi eld. Something interesting
happens when you move a conductor (a material that can
carry, or conduct, electricity) through a magnetic fi eld. The
fi eld causes electricity—an electric current—to fl ow in the
conductor. A current will also fl ow if the conductor is held
steady and the magnetic fi eld moves past it. Either of these
methods may be used in a generator to produce a current.
Nuclear power plant generators usually get the
movement they need from the turning movement produced
by a turbine. The electric current that comes from a nuclear
power plant generator switches direction many times a
second. The current is known as alternating current. This is
the kind of current used in the public power system, or grid.