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Units & Symbols for Electrical & Electronic Engineers


Year: 2016
Language: english
Author: The IET
Genre: Reference book
Format: PDF
Quality: eBook
Pages count: 37
Description: In the expression I = 16 mA, I is the quantity symbol for the physical phenomenon of electric current, and 16 is its numerical
value in terms of the decimal submultiple (10–3) of a unit (ampere) of current; mA is the unit symbol for milliampere. Other
symbols (such as j, exp, Cu) are used to indicate mathematical operations, chemical elements etc. Frequently occurring technical
phrases are commonly rendered as abbreviations (such as e.m.f., p.d.). In circuit diagrams, graphical symbols identify network
components and devices.
International letter symbolism is based on the Roman and Greek alphabets. There are fewer than 90 distinctive capital and small
letters to represent some thousands of scientific and technical quantities, and extensive duplication is unavoidable. Priority is
given here to electrical, electronic and manufacturing engineering, and quantities in associated fields are, where necessary,
assigned alternative or second-choice symbols.
The units and symbols listed throughout this booklet conform to the recommendations of the International Electrotechnical
Commission (IEC) and the British Standards Institution (BSI). Additionally, because of their common usage, in the Logic Symbols
under Section 12 some distinctive-shape binary logic symbols have been used.

Contents

Contents
Introduction 1
1. Abbreviations for words and phrases 2
2. Printing conventions 3
Letter symbols, subscripts 3
3. Unit symbols 4
Compound symbols 4
4. Numerical values 5
The decimal sign 5
Multiplication of numbers 5
5. The International System of Units 6
SI base units and supplementary units 6
SI derived units 7
Non-SI units 7
6. Quantity symbols for mechanics, thermodynamics, illumination 8
7. Quantity symbols for electrotechnics 10
8. Subscripts and other uses of letters and numbers 13
General 13
Semiconductors 15
9. Mathematical symbols 16
10. Physical constants 18
11. Conversion factors 19
Length 19
Area, Volume 19
Mass, Density 19
Velocity 19
Force, Pressure, Torque 20
Energy, Power 20
Nucleonics, Radiation etc. 20
Special remark on Logarithmic quantities and units 20
12. Graphical symbols 22
Connections and network elements 22
Power plant 23
Electronic devices 23
Logic symbols 24
Optic fibre symbols 25
Telecommunication symbols 25
Microwave devices 26
Flowchart symbols 26
13. Some abbreviations 27
Commonly used abbreviations in optical, logical and microprocessor circuits 27
Component identification abbreviations 28
14. Letter and digit code for R & C values 29
Appendices
A List of Standards used in compilation of ‘Units & Symbols’ 30
B Typefaces used: English alphabet, Greek alphabet 31

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