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A current or magnet that can be created by the use of magnetic fields
Induced
Electric current that continually changes direction
Alternating current
A region where there is a force on magnetic materials or current-carrying wires
Magnetic field
Useful output energy transfer divided by the total energy input
Efficiency
Device that creates electricity when a wire is moved so that it cuts magnetic field lines
Generator
Device that increases an alternating potential difference from the primary to secondary coil
Step-up transformer
A material that is magnetic only when it is placed in the magnetic field of another magnet
Induced magnet
Device in a d.c motor that allows the motor to spin without reversing direction
Split-ring commutator
When a force between two objects draws them closer together
Attracts
Object or material that produces its own magnetic field
Permanent magnet
A device that produces a direct current from the rotation of a coil in a magnetic field
dynamo
A coil of current-carrying wire that generates a magnetic field
Solenoid
Device that decreases an alternating potential difference from the primary to secondary coil
Step-down transformer
Relationship where one variable increasing at the same rate as the other
Proportional
Interaction between a magnetic field and a current-carrying wire that causes the wire to move
Motor effect
A device where a coil rotates in a magnetic field to produce A.C.
Alternator
Network of cables that links power stations to consumers across the country
National grid
Unit of magnetic flux density
Tesla
Device that converts electrical energy to kinetic
Motor
The amount of magnetic flux in a given area
Magnetic flux density