Physical Science - Chapter 20 

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21 Terms

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magnet

any material or object that can produce a magnetic field

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magnetism

the properties of magnets and magnetic fields and phenomena that they produce

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magnetic pole

one of the two regions of concentrated magnetic fields in a magnet; traditionally called the north and south poles

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magnetic field

the region surrounding a magnet or current-containing wire that can apply a magnetic force on magnetic materials

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magnetic South pole

the magnetic pole in the Southern Hemisphere

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magnetic North pole

the magnetic pole in the Northern Hemisphere

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magnetic declination

the angular difference between the directions to the geographic and magnetic North Poles

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magnetic domain

a group of atoms whose individual magnetic fields are aligned

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ferromagnetism

the physical property in which a materials magnetic domains spontaneously align to an external magnetic field

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right-hand rule

a mnemonic device used to remember the direction of the magnetic field induced by an electric current moving through a wire

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solenoid

a coil of current-carrying wire used as a magnet

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electromagnet

the combination of a strong magnet and an electrified wire coil

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electromagnet induction

the principle that voltage is produced in a conductor whenever the conductor whenever the conductor and a magnetic field are changed relative to each other

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generator

a device that converts mechanical energy into electrical energy by electromagnetic induction

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rotor

the rotating portion of a generator

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stator

the stationary portion of a generator

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prime mover

the agent that provides the mechanical energy to turn the rotor of a generator

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commutator

a structure in DC motors and generators that converts currents between DC and AC

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transformer

a device that uses electromagnetic induction to increase or decrease the voltage of an AC current

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step-down transformer

a transformer that is designed to decrease an output voltage

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step-up transformer

a transformer that is designed to increase an output voltage