Lust CDA3000 - Page 294

Engineering Guide CDA3000
A-3
Appendix A Formula bank
DE
EN
1
2
3
4
5
6
7
A
Frequency (c speed of
light)
f Hertz Hz, (kHz) f = c/
λ
Wavelength
λ
Meter m, (cm)
λ
=c/f
Electrical charge Q Coulomb C, As Q=l·t
Capacitance C Farad F C = Q/U
Inductance L Henry H; Vs/A
Power output P Watt, Joule/s W; VA, J/s P = U · I
Work W, A Joule J; Ws W = P · t
Force, (weight) F, (G) Joule/m J/m; Ws/m F = W/1
El. field strength E Volt/m V/m; N/C E = U/1
Dielectric const.
ε
Farad/m F/m; C/Vm
ε
=c·1/A
El. field constant, var.
εο
Farad/m F/m; C/Vm
ε
=
ε
o ·
ε
r
Dielectric constant
ερ
--
ε
r
=
ε
/
ε
o
El. displacement flux
ψ
Coulomb C, As
El. displacement den-
sity
D
Coulomb/m
2
C/m
2
D=Q/A
El. current density S, (i)
Ampere/m
2
A/m
2
S=I/A
El. loading
θ
Ampere A; J/Wb
θ
=H·I
Magnetic flux
Φ
Weber, Maxwell Wb; Vs; M
Φ
=B·A
Magn. voltage V Ampere A; J/Wb V = H · s
Magn. field strength H
Amp./m;
Oerstedt
A/m; N/Wb, (Ö) H=B/µ=I·w/l
Magn. inductance
(flux density)
B
Tesla; Weber/ m
2
(Gauß)
T; Wb/m
2
(G)
B=µ·H
Magn. field constant
µ
o
Henry/m H/m; Wb/Am
µ
o
=4
π
/10
7
Permeability, absolute µ Henry/m H/m; Wb/Am µ = B/H
Permeability coeffi-
cient
µ
t
--
µ
t
=µ/µ
o
Magn. polarization J Tesla; Weber/ m T; Wb/m²
J=B-µ
o
Variable
Formula
symbol
Units Formula
(A cross-
sectional area)
Name Abbreviation
Note: For vector values many formula symbols are designated by German letters.
Table 1.1 SI units