A-2
Engineering Guide CDA3000
Appendix A Formula bank
A.1
Mathematical
symbols
Appendix
Equality and inequality
~
proportional
<
less than
≈
about, approximately
>
greater than
=
equal to
≥
greater than or equal to
corresponding to
≤
less than or equal to
≡
identically equal
«
very small against
not identically equal
»
very large against
≠
not equal, unequal
Geometric symbols
||
parallel
≅
congruent
not parallel
angle
↑↑
equivalent to parallel
distance AB
↑↓
opposite to parallel
arc AB
⊥
rectangular to, perpendicular to
~
similar
∆
triangle
Table 7.3
Geometric symbols
Variable
Formula
symbol
Units
Formula
(A cross-
sectional area)
Name
Abbreviation
Voltage
U
Volt
V
U = I • R
Current rating
I
Ampere
A
I = U/R
Resistance
R
Ohm
Ω
R = U/I
Conductivity, elec.
G
Siemens
S, 1/
Ω
G = 1/R
Specif. el. resistance
ρ
Ohm/m
Ω
m; Vm/A
ρ
= 1/
σ
El. conductivity
σ, χ
Siemens/m
S/m; A/Vm
σ
= 1/
ρ
Note:
For vector values many formula symbols are designated by German letters.
Table 1.1
SI units
=
AB
AB
A.1.1 SI units
Содержание CDA3000
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Страница 315: ...A 24 Engineering Guide CDA3000 Appendix A Formula bank Movement by rack Movement by cable reel Movement by spindle ...
Страница 317: ...A 26 Engineering Guide CDA3000 Appendix A Formula bank Indexing table with eccentric loads ...
Страница 336: ...Engineering Guide CDA3000 A 45 DE EN FR 1 2 3 4 5 6 A Appendix B Practical working aids for the project engineer ...