1 Flashcards
A device that produces static electricity?
electrostatic generator
The most common electrostatic generator used today?
Van de Graaff generator
A large discharge of static electricity between the ground and a cloud during a thunderstorm?
lightning
A device for protecting building and other structures from lightning strikes.
lightning rod
An eerie bluish glow that sometimes appears around pointed objects during storms
(a natural electrostatic phenomenon called corona discharge).
St. Elmo’s fire
An early device used to store an electric charge.
Leyden jar
A device used to store a static electricity charge (modern).
capacitor
An electrostatic method producing images on paper.
Xerography
An electric lamp that produces light by heating a thin wire called a filament to a high temperature .
(The first electric light suitable for a household).
incandescent lamp
Produces light by passing an electric current through a long tube filled with a low-pressure mixture of mercury and argon.
fluorescent lamp
Coiled tubes about the size of a regular incandescent bulb. They operated the same way but they can be used in sockets designed for incandescent bulbs.
compact fluorescent lamps
An electric discharge lamp filled with neon gas instead of mercury vapor.
neon lamp
Semiconductor devices that emit light when a direct electric current is applied.
light-emitting diodes
A simple device that converts electricity to back-and-forth motion.
solenoid
A device for communicating over long distances by means of electromagnets.
telegraph
Allows electromagnets to operate switches, an electrical switch operated by an electromagnet.
relay
A device that converts pulses of electricity into sound waves.
loudspeaker
The most important device for converting electricity into motion.
electric motor
A cell which are not designed to be recharged.
voltaic cells
A cell that can be recharged by sending a current through them backward.
storage cells
A negative terminal which produces an excess of electrons.
anode
A positive terminal which has a deficiency of electrons.
cathode
One or more electrochemical cells connected to terminals as a single source of current.
battery
The ability of magnetism to convert mechanical motion into electric current.
electromagnetic induction
A device that uses electromagnetic induction to produce electricity.
generator
A device in which a conducting fluid passes through a magnetic field at high speed to generate electricity.
magnetohydrodynamic generator
A device that increases or decreases the voltage of alternating current using electromagnetic induction.
transformer
Uses movement to produce electricity
generator
Uses electricity to produce movement.
motor
The extent of a planets magnetic field in space
magnetosphere
Display of shimmering light
aurora
Two vast, doughnut-shaped belts of high-speed charged particles
Van Allen radiation belts
The outer boundary of the magnetosphere
magnetopause
A stream of plasma that emanates from the sun
solar wind
Circles the earth halfway between the two magnetic poles
magnetic equator
Connect locations having equal inclination
isoclinic lines
compass constructed with a magnet free to swing vertically would reveal the angle at which the lines of flux enter the earth
inclination
The line connecting all points where a compass needle points true north
agonic line
Connect points of equal declination
isogonic lines
A compass needle is usually a few degrees off from pointing true north
angle of declination
A navigational device consisting of a magnet free to swing horizontally so that it always points true north
magnetic compass
The force existing in a magnetic field that causes moving electric charge to deviate from its original path
deflecting force
Temperature at which a ferromagnetic materials domains dissapear
Curie point
The resistance of a magnetic field to be demagnetized by a magnetic field
coercivity
A device that produces a strong magnetic field when electricity passes through it
electromagnet
Temporary magnetization caused by placing an object within a magnetic field
magnetizing by induction
A magnet made from a magnetically soft material called
temporary magnet
A permanent magnet by stroking it with a magnet
magnetizing by conduction
Magnets made from magnetically hard materials
permanent magnets
Materials whose domains strongly resist changes in the direction of their magnetic fields
magnetically hard
Substances that can be quickly magnetized even in a weak magnetic field
magnetically soft
Some substances have several unpaired electrons per atom, making them strongly attracted to magnets
ferromagnetic
A material weakly attracted to a magnet
paramagnetic
Substances with no unpaired selections
diamagnetic
