Final exam Flashcards
Oersted’s experiment:
Electric current produces a magnetic field which in turn produces a mechanical motion.
Oersted’s experiment is the basis for:
the electric motor.
Faraday’s experiment:
Mechanical motion (the motion of a magnet moving near a coil of wire) induces electricity in a coil of wire.
Faraday’s experiment is the basis for:
the electric generator.
An electric generator (or dynamo) is:
a device that converts mechanical energy to electrical energy by electromagnetic induction.
The two components that an electric generator has to bring about the continual cutting of magnetic flux by a conductor are:
A powerful electromagnet (to set up a magnetic field.) and an armature (to provide motion.).
An armature is:
a coil of wire rotated mechanically in the magnetic field.
In an A/C generator, the ends of the armature are connected separately to:
the metal slip rings which rotate with the armature.
Carbon brushes rest against each slip ring in an A/C generator allowing them to
rotate.
Slip rings and brushes permit the external circuit to remain stationary while:
the armature rotates without breaking the electrical contact between them. (This conveys the electrical current from the armature to the circuit.)
What allows electrons to flow without interruption in an A/C generator?
The slip rings and carbon brushes which permit the external circuit to remain stationary while the armature rotates without breaking the electrical contact between them.
