Units & Abreviations - Electrical Notebook

Canberra
Australia

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Units & Abreviations

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Units And Abbreviations

Units
Unit
Symbol
Definition
Amp
A
Measure of electricity current
CandelCdMeasure of luminance
FarradFMeasure of capacitance
GramgMeasure of weight
HenryHMeasure of inductance
HertzHzMeasure of frequency
Lumen
Lm
Measure of light at a source
Lux
Lx
Measure of light at a plane
Kelvin
K
Measure of light colour temperature
MetermMeasure of distance
Ohm
 
Measure of resistance
Per Unitp.u.Ratio of measurements
Ra
Ra
Measure of colour render grade
SecondsMeasure of time
Volt
V
Measure of electricity voltage
VAVAMeasure of electrical power (Apparent)
Watt
W
Measure of electrical power (Real)

Multiples
Multiplier
Symbol
Value
Literal
picopx 10 -12Trillionth
nanonx 10 -9Billionth
microµx 10 -6Millionth
milimx 0.001Thousandth


x 1Unit
Kilokx 1,000Thousand
MegaMx 1,000,000Million
GigaBx 1,000,000,000Billion
TeraT
x 1,000,000,000,000
Trillion

Algebraic Symbols
Symbol
Definition


C
Capacitance
dDepth
E
Energy (Non Lighting)
Em
Illumination
fFrequency
hHeight
ICurrent
K
Constant
LInductance
lLength
PPower
RResistance
Ra
Grade of colour rendering
rRadius
U
Uniformity
UGRUnified Glare Rating
VVoltage
wWidth
XReactance
Z
Impedance
Z0Impedance at source
Z1 . . . ZxImpedance components
~


Abreviation
Abbreviation
Definition
BCA
Building Code of  Australia
BS
British Standard
CCTCircuit
CFL
Compact Fluorescent Lamp
CSACross Sectional Area
CIBSE
Chartered Institute of Building Services
GLS
General Lighting Service
IEEInstitute of Electrical Engineers
IETInstitute of Engineering & Technology
LED
Light Emitting Diode
MH
Metal Halide
SLL
Society of Light and Lighting
SON
Sodium Discharge Lamp
TxTransformer
UtUtility
T5 / T8 / T12
Nomenclature for fluorescent lamp physical size classification

Colour Rendering Index
Colour rendering index is a grade of the light quality and the mark of a quality illuminaince hitting the surface of the subject. This incorporates consideration of the distribution of light quality throughout the spectrum. A colour rendering of 85Ra or above is suitable for reading and most modern LED, fluorescent and metal halide lights will provide this.

Glare
The glare index rating is a grade of the comfort of the light. As can be experienced, looking directly into a light is very harsh and uncomfortable on the eyes. The construction of the luminaire, the location and addition of baffles or screens will assist in reducing the level of glare to a comfortable level. The perception of glare marked by this index.
(DISCLAIMER & WARNING - do not try looking directly at an energised lamp and especially practice extreme caution with LED lights as this will cause extreme discomfort)

Location
Canberra,
Australia.
DISCLAIMER
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