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26 Cards in this Set

  • Front
  • Back
Electrons are given electric potential energy (voltage) and electrons in motion create magnetism
Sources of electromotive force
Source of Electric Potential
A device that converts chemical energy into electrical energy
1820 Demonstrated a direct link between electric and magnetic laws.
Electric current produced a magentic field strong enough to cause a compass needle to move
Oersted Experiment
Any change in motion induces a ....
Magnetic Field
A charge at rest produces ...
NO magnetic field
Electrons flowing through a wire produce a
magnetic field around that wire (basis for the solenoid)
a coil consisting of a series of loops, which serve to increase the flux density
Solenoid (electromagnet)
When the solenoid wire is coiled the magnetic fields will... and all the field lines add together to make the magnetic field
overlap each other; Stronger
In a solenoid - Stacking more loops on top of each other
increases the intensity of the magnetic field.
A magnetic field can be made stronger by wrapping the wire around ....
ferromagnetic material such as iron
A current carrying coil of wire wrapped around and iron core, which intensifies the magnetic field is a/an
A means of transferring electrical potiential energy (Voltage) from one position to another, as in a transformer is ....
Electromagnetic Induction
Electric current cannot be induced in a circiut simply because a magnetic field is present.
Faraday's Law // Required components are:
Magnetic Field
Relative Motion
To induce a current using a magnetic field, the magnetic fiedl cannot be constant but must be changing.
Faraday's Law
Move a conductor through a stationary magnetic field
A method to Induce a Current
Move magnetic lines of force across a conductor
A method to Induce a Current
Vary the strength of a stationary magnetic field through a conductor
A method to Induce a Current
Electromagnetic Induction: an electric current is induced ina circiut if some part of that circuit is in a changing magnetic field. (move the wire or the magnetic field)
1st Law of Electromagnetic Induction // Faraday's Law
The direction of induced electric current opposes the action that induces it or.. induced current flow creates an opposing magnetic field
2nd Law of Electromagnetic Induction // Lenz's Law
Basis for transformer,
Two Coils,
Varying current supplied to primary coil,
Induces current in secondary coil
Mutual Induction
The generation of an alternating current in a secondary coil by supplying an alternating current to the primary coil
Mutual Induction of a magnetic field
Always present in coils supplied with alternating currents
Constantly changing currrent polarity
Inductive Reactance
Self Induction
Fundamental to tranformers, electric motors, and generators
Self Induction
Induction of an opposing voltage in a single coil by its own changing magnetic field is called ...
Self Induction