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SI electromagnetism units |
Symbol [citation needed] |
Name of Quantity |
Derived Units |
Unit |
Base Units |
I |
Magnitude of current |
ampere (SI base unit) |
A |
A = W/V = C/s |
q |
Electric charge, Quantity of electricity |
coulomb |
C |
A·s |
V |
Potential difference or Electromotive force |
volt |
V |
J/C = kg·m2·s−3·A−1 |
R, Z, X |
Resistance, Impedance, Reactance |
ohm |
Ω |
V/A = kg·m2·s−3·A−2 |
ρ |
Resistivity |
ohm metre |
Ω·m |
kg·m3·s−3·A−2 |
P |
Power, Electrical |
watt |
W |
V·A = kg·m2·s−3 |
C |
Capacitance |
farad |
F |
C/V = kg−1·m−2·A2·s4 |
|
Elastance |
reciprocal farad |
F−1 |
V/C = kg·m2·A−2·s−4 |
ε |
Permittivity |
farad per metre |
F/m |
kg−1·m−3·A2·s4 |
χe |
Electric susceptibility |
(dimensionless) |
- |
- |
G, Y, B |
Conductance, Admittance, Susceptance |
siemens |
S |
Ω−1 = kg−1·m−2·s3·A2 |
σ |
Conductivity |
siemens per metre |
S/m |
kg−1·m−3·s3·A2 |
H |
Magnetic field, magnetic field intensity |
ampere per metre |
A/m |
A·m−1 |
Φm |
Magnetic flux |
weber |
Wb |
V·s = kg·m2·s−2·A−1 |
B |
Magnetic flux density, magnetic induction, magnetic field strength |
tesla |
T |
Wb/m2 = kg·s−2·A−1 = N·A−1·m−1 |
|
Reluctance |
ampere-turn per weber |
A/Wb |
kg−1·m−2·s2·A2 |
L |
Inductance |
henry |
H |
Wb/A = V·s/A = kg·m2·s−2·A−2 |
μ |
Permeability |
henry per metre |
H/m |
kg·m·s−2·A−2 |
χm |
Magnetic susceptibility |
(dimensionless) |
- |
- |