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Magnetism and Electromagnetism
A relay is an electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current.
True
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True
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Magnetism and Electromagnetism
If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.
Ampere-turn is the unit of magnetomotive force (mmf).
The tesla is the unit of magnetic flux.
Materials with a low retentivity do not retain a magnetic field very well.
Hysteresis is the number of lines of force per unit area in a magnetic field.
Lenz's law defines the polarity of the induced voltage.
A magnetic field is made up of flux lines.
Reluctance in a magnetic circuit is analogous to current in an electrical circuit.
Electromagnetic induction is the force that produces a magnetic field.
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