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