device that makes use of the generator effect to generate AC
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attraction
opposite poles will experience a force towards each other. The force between a magnet and magnet material is always one of attraction
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current carrying wire
when current flows through a wire, a magnetic field is generated around it. The strength of the field is dependent on the magnitude of the current and the distance from the wire
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dynamo
device that makes use of the generator effect to generate DC
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electric motor
a current-carrying coil of wire in a magnetic field. The two sides of the coil that are perpendicular to the magnetic field experience opposite forces causing rotation
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electromagnet
a solenoid with an iron core
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Fleming’s Left Hand Rule
force (thumb), current (second finger), magnetic field (first finger) when a current-carrying wire is placed in a magnetic field
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Generator Effect
When there is relative motion between an electrical conductor and a magnetic field, a P.D will be induced across the ends of the conductor. A current will flow if the conductor is part of a complete circuit
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induced magnet
material that becomes a magnet when it is placed in an existing magnetic field, but loses its magnetism quickly when removed from the field
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magnetic compass
device containing a small bar magnet that points in the direction of the Earth’s magnetic field
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Magnetic field line
lines representing the strength and direction of a magnetic field. The field line direction at any point is in the direction that a force would act on another north pole if placed at that point
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magnetic field
region around a magnet in which another magnet or magnetic material will experience a force
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magnetic materials
iron, steel, cobalt and nickel
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magnetic poles
regions of a magnet where the magnetic forces are at their strongest
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microphone
device that uses the generator effect to convert the pressure variations of sound waves into variations in the electrical current of a circuit
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motor effect
when a current-carrying wire is placed in a magnetic field, a force will be experienced between the wire and the magnet responsible for the field
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permanent magnet
magnet that produces its own magnetic field
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repulsion
like poles will experience forces in opposite directions
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solenoid
a wire wrapped into the shape of a coil that has a strong and uniform magnetic field in it. Its magnetic field strength can be increased with an iron core
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step down transformer
transformer that has a smaller P.D in the secondary coil that in the primary core
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step up transformer
transformer that has a larger P.D in the secondary coil than in the primary core
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Tesla
unit of magnetic flux density
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transformer
iron core with a primary and secondary coil of wire wound around opposite ends
Studied by 17 people
