Abbreviations from N-Zt

Abbreviations used in Electronics N to TWT

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

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