Abbreviations

f

   Frequency

 

FET

   Field effect transistor

 

 

FF

   Flip Flop

 

 

fil

   Filament

 

 

FM

   Frequncy modulation

 

 

f_r

   Frequency at resonance

 

 

fsk

   frequency-shift keying

 

 

FSD

   Full scale deflection

 

 

G

   Gravitational force

 

 

G

   Conductance

 

 

G

   Giga (10⁹ )

 

 

H

   Henry

 

 

H

   Magnetic field intensity

 

 

H

   Magnetizing flux

 

 

h

   hecto (10² )

 

 

h

   Hybrid

 

 

HF

   High frequency

 

 

hp

   Horsepower

 

Hz

   Hertz

 

I

   Current

 

 

i

   Instantaneous current

 

 

I_B

   DC Base current

 

 

I_C

   DC Collector current

 

 

IC

   Integrated circuit

 

 

I_e

   Total emitter current

 

 

I_eff

   Effective current

 

 

IF

   Intermediate frequency

 

 

I_max

   Maximum current

 

 

I_min

   Minimum current

 

 

I/O

   Input/output

 

 

IR

   Infrared

 

 

I_R

   Resistor current

 

 

I_S

    Secondary current

 

 

I_T

    Total current

 

 

JFET

    Junction field effedt transistor

 

 

K

   Coefficient of coupling

 

 

k

   Kilo (10³ )

 

 

kHz

   Kilohertz

 

 

kV

   Kilovolt

 

 

kVA

  Kilovoltampere

 

 

kW

   Kilowatt

 

 

kWh

   Kilowatt-hour

 

 

L

   Coil, inductance

 

 

LC

   Inductance-capacitance

 

 

LCD

   Liquid crystal display

 

 

L-C-R

   Inductance-capacitance-resistance

 

 

LDR

   Light-dependent resistor

 

 

LED

   Light emitting diode

 

 

LF

   Low frequency

 

 

L_M

   Mutual inductance

 

 

LNA

   Low noise amplifier

 

 

LO

   Local oscillator

 

 

LSI

   Large scale integration

 

 

L_T

    Total inductance

 

 

M

    Mega (10⁶ )

 

 

M

   Mutual conductance

 

 

MI

   Mutual inductance

 

 

m

   Milli (10^-3 )

 

 

mA

   Milliampere

 

 

mag

   Magnetron

 

 

max

   Maximum

 

 

MF

   Medium frequency

 

 

mH

    Millihenry

 

 

MHz

    Megahertz

 

 

min

    Minimum

 

 

mm

     Millimeter

 

 

mmf

     Magnetomotive force

 

 

MOS

      Metal oxide semiconductor

 

 

MOSFET

       Metal oxide semiconductor field effect transistor

 

 

    MPU

        Microprocessor unit

 

 

     MSI

        Medium scale integrated circuit

 

 

     mV

        Millivolt

 

 

     mW

        Milliwatt

N

Number of turns in an inductor

 

N

Revolutions per minute

 

 

n

Nano (10^-9)

 

 

 

N

Negative

 

 

nA

Nanoampere

 

 

NC

Normally closed

 

 

NC

No connection

 

 

NEG, neg

Negative

 

 

nF

Nanofarad

 

 

nH

Nanohenry

 

 

nm

Nanometer

 

 

NO

Normally open

 

 

NPN

Negative-positive-negative

 

 

ns

Nanosecond

 

 

nW

Nanowatt

 

 

OP AMP

Operational amplifier

 

 

P

Pico (10^-12)

 

 

P

Power

 

 

p

Instantaneous power

 

 

P

Positive, also peak

 

 

PA

Public address or power amplifier

 

 

pA

Picoampere

 

 

PAL

Programmable Array Logic

 

 

PAM, pam

Pulse amplitude modulation

 

 

P_ap

Apparent power

 

 

P_av

Average power

 

 

PCB

Printed circuit board

 

 

PCM, pcm

Pulse-code modulation

 

 

PDM

Pulse-duration modulation

 

 

pF

Picofarad

 

 

PLD

Programmable Logic Device

 

 

PLL

Phase locked loop

 

 

PM

Phase modulation, also Permanent magnet

 

 

PNP

Positive-negative-positive

 

 

POT, pot

Potentiometer

 

 

P-P

Peak to peak

 

 

PPM

Pulse-position modulation

 

 

PRF

Pulse repetition frequency

 

 

PRT

Pulse repetition time

 

 

pw

Pulse width

 

 

PWM, pwm

Pulse width modulation

 

 

Q

Charge, also quality

 

 

q

Instantaneous charge

 

 

R

Potentiometer

 

 

R

Resistance

 

 

RAM

Random access memory

 

 

RC

Resistance-capacitance, also Radio controlled

 

 

rcvr

Receiver

 

 

rect

Rectifier

 

 

ref

Reference

 

 

rf

Radio frequencies

 

 

RF

Radio frequencies

 

 

RFI

Radio frequency interference

 

 

R_L

Load resistor

 

 

RLC

Resistance-capacitance-inductance

 

 

RMS, rms

Root mean square

 

 

ROM

Read only memory

 

 

rpm

Revolutions per minute

 

 

SCR

Silicon controlled rectifier

 

 

SHF

Super high frequency

 

 

SIP

Single in-line package

 

 

SNR

Signal-to-noise ratio

 

 

SPDT

Single pole double throw

 

 

sq cm

Square centimeter

 

 

SSB

Single sideband

 

 

SW

Short wave

 

 

SWR

Standing-wave ratio

 

 

SYNC, sync

Synchronous

 

 

T

Tera (10¹²)

 

 

T

Torque

 

 

T

Transformer

 

 

t

Time in seconds

 

 

TC

Time constant, also temperature coefficient

 

 

TE

Transverse electric

 

 

temp

Temperature

 

 

THz

Terahertz

 

 

TM

Transverse magnetic

 

 

TR

Transmit-receive

 

 

TTL

Transistor-transistor logic

 

 

TV

Television

 

 

TWT

Travelling wave tube

UHF

Ultra high frequency

 

UHV

Ultra high voltage

 

 

UJT

Unijunction transistor

 

 

UV

Ultraviolet

 

 

V

Vacuum tube

 

 

V, v

Volt

 

 

v

Instantaneous voltage

 

 

VA

Volt ampere

 

 

V_av

Voltage (average value)

 

 

V_BE

DC voltage base to emitter

 

 

V_c

Capacitive voltage

 

 

V_CE

DC voltage collector to emitter

 

 

VCO

Voltage controlled oscillator

 

 

VHF

Very high frequency

 

 

V_in

Input voltage

 

 

V_L

Inductive voltage

 

 

VLF

Very low frequency

 

 

V_m, V_max

Maximum voltage

 

 

VOM

Volt ohm milliameter

 

 

V_out

Output voltage

 

 

V_p

Primary voltage

 

 

V_S

Source voltage

 

 

VSWR

Voltage standing wave ratio

 

 

V_T

Total voltage

 

 

W

Watt

 

 

X_C

Capacitive reactance

 

 

X_L

Inductive reactance

 

 

Y

Admittance

 

 

Z

Impedance

 

 

Z_in

Input impedance

 

 

Z_o

Output impedance

 

 

Z_p

Primary impedance

 

 

Z_s

Secondary impedance

 

 

Z_T

Total impedance