Page 339 - Electromechanical Devices and Components Illustrated Sourcebook

Glossary 301

isolation transformer A transformer whose primary and fd Abbreviation for microfarad
secondary coils are electrically isolated mH Abbreviation for millihenery
micro Abbreviation for 1/1,000,000
J microwave AC signal from 1 gigahertz and up
J Abbreviation for joule milli Abbreviation for 1/1000
jack Female connector milliamp 1/1000 of an ampere
jones plug A class of multi pin connectors morse code A communications protocol which uses dots
joule A unit of measure describing energy and dashes
junction A connection between conductor or motor-generator set A motor driven generator
semiconductors moving coil A coil which generated a signal by moving in
reference to a fixed magnet
K
k Abbreviation for 1000 N
kelvin An absolute temperature scale using the same unit nano Abbreviation for 1 billionth
division as centigrade negative The – side of a circuit
kHz The abbreviation for kilo hertz NEMA Abbreviation for National Electric Manufactures
klystron A vacuum tube used to amplify or generate high Association
frequencies neon bulb A light bulb which generates a glow within a
knife switch A switch constructed from a pivoting bar neon gas atmosphere
knot Nautical mile (6,080.2 feet) NC Abbreviation for normally closed
kV Abbreviation for kilovolt NO Abbreviation for normally open
kW Abbreviation for kilowatt
O
L octal Base eight
laminated core A iron core made by stacking thin pieces of ohm The unit of measure for electrical resistance
sheet metal ohmmeter A voltmeter specifically configured to read
lamp An electrical device intended to produce visible light ohms
laser Abbreviation for Light Amplification by Stimulated open circuit A circuit that does not have a return path
Emission of Radiation open voltage The voltage present in the absence of a load
lead-acid cell A liquid electrolyte battery opto-isolator A device that is intended to electrically
leak A condition that creates a high resistance short to isolate a communications line using light transmission
ground oscillator AC signal source
lightning arrestor A device that will shunt a lighting strike oscilloscope An instrument designed to provide a visual
to earth ground display of an electrical signal
loop antenna A wire arranged in a loop for receiving
electrostatic transmissions P
loudspeaker A device designed to reproduce sound in pad A solder point on a printed circuit board
reference to an electrical signal parallel connection Two or more components arranged in a
low frequency AC signals with a frequency between 30 Hz parallel configuration
to 300 kHz patch cord A multiconductor cable with plugs on both ends
peak voltage The highest voltage in a signal
M permanent magnet A permanently magnetized material
magnetic amplifier A device that takes advantage of the phone jack/plug A type of plug that is common in audio
saturable core characteristics of a transformer to provide circuits
amplification phono jack/plug A type of plug that is common in
magnetic circuit The path of magnetic flux low-level audio circuits
magnetic field The magnetic circuit that surround a magnet photocell A device that produces electricity from light
magnetron A vacuum tube used to generate high-frequency piezoelectric The action of producing electrical energy
signals from bending a crystals
matching transformer A transformer specifically designed plasma A glow discharge in a gas
to match impendence of two incompatible circuits plate A term for the anode in a vacuum tube
meg Abbreviation for mega-ohm potentiometer A variable resistor
mega Abbreviation for 1 million primary winding The input coil of a transformer
mercury vapor lamp A high intensity lamp which uses printed circuit board An insulating board with foil
gaseous mercury conductors laid out on the surface
mercury contact A contact set that is wetted with mercury probe A test terminal for hand operation
metalized A layer of metal deposited onto an insulator pyrometer An instrument for measuring temperature