Words
to Know
Alternating
current (AC): Electric
current in which the direction of flow changes back and forth rapidly and at a
regular rate.
Armature: A part of a generator
consisting of an iron core around which is wrapped a wire.
Commutator: A slip ring that serves to
reverse the direction in which an electrical current flows in a generator.
Direct
current (DC): Electrical
current that always flows in the same direction.
Electromagnetic
induction: The production of an
electromotive force (something that moves electricity) in a closed electrical
circuit as a result of a changing magnetic field.
Slip
ring: The device in a generator that
provides a connection between the armature and the external circuit.
Faraday
also discovered that it makes no difference whether the coil rotates within the
magnetic field or the magnetic field rotates around the coil. The important
factor is that the wire and the magnetic field are in motion in relation to
each other. In general, most AC generators have a stationary (fixed) magnetic
field and a rotating coil, while most DC generators have a stationary coil and
a rotating magnetic field.
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