Susceptance
Appearance
In electrical engineering, the susceptance (B) is the imaginary part of the admittance. In SI units, the susceptance is measured in siemens. In June of 1887, Oliver Heaviside used the term "permittance" which later became susceptance.
Mathematics
where
Y is the admittance, measured in siemens
G is the conductance, measured in siemens
B is the susceptance, measured in siemens.
The admittance (Y) is the inverse of the impedance (Z)
where
Z is the impedance, measured in ohms
R is resistance, measured in ohms
X is the reactance, measured in ohms.
Note: The susceptance is NOT the inverse of the reactance.
The magnitude of admittance is given by:
SI electricity units
Symbol[1] | Name of quantity | Unit name | Symbol | Base units |
---|---|---|---|---|
E | energy | joule | J = C⋅V = W⋅s | kg⋅m2⋅s−2 |
Q | electric charge | coulomb | C | A⋅s |
I | electric current | ampere | A = C/s = W/V | A |
J | electric current density | ampere per square metre | A/m2 | A⋅m−2 |
U, ΔV; Δϕ; E, ξ | potential difference; voltage; electromotive force | volt | V = J/C | kg⋅m2⋅s−3⋅A−1 |
R; Z; X | electric 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 | electric power | watt | W = V⋅A | kg⋅m2⋅s−3 |
C | capacitance | farad | F = C/V | kg−1⋅m−2⋅A2⋅s4 |
ΦE | electric flux | volt metre | V⋅m | kg⋅m3⋅s−3⋅A−1 |
E | electric field strength | volt per metre | V/m = N/C | kg⋅m⋅A−1⋅s−3 |
D | electric displacement field | coulomb per square metre | C/m2 | A⋅s⋅m−2 |
ε | permittivity | farad per metre | F/m | kg−1⋅m−3⋅A2⋅s4 |
χe | electric susceptibility | (dimensionless) | 1 | 1 |
p | electric dipole moment | coulomb metre | C⋅m | A⋅s⋅m |
G; Y; B | conductance; admittance; susceptance | siemens | S = Ω−1 | kg−1⋅m−2⋅s3⋅A2 |
κ, γ, σ | conductivity | siemens per metre | S/m | kg−1⋅m−3⋅s3⋅A2 |
B | magnetic flux density, magnetic induction | tesla | T = Wb/m2 = N⋅A−1⋅m−1 | kg⋅s−2⋅A−1 |
Φ, ΦM, ΦB | magnetic flux | weber | Wb = V⋅s | kg⋅m2⋅s−2⋅A−1 |
H | magnetic field strength | ampere per metre | A/m | A⋅m−1 |
F | magnetomotive force | ampere | A = Wb/H | A |
R | magnetic reluctance | inverse henry | H−1 = A/Wb | kg−1⋅m−2⋅s2⋅A2 |
P | magnetic permeance | henry | H = Wb/A | kg⋅m2⋅s-2⋅A-2 |
L, M | 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 |
χ | magnetic susceptibility | (dimensionless) | 1 | 1 |
m | magnetic dipole moment | ampere square meter | A⋅m2 = J⋅T−1 | A⋅m2 |
σ | mass magnetization | ampere square meter per kilogram | A⋅m2/kg | A⋅m2⋅kg−1 |
External links
- ^ International Union of Pure and Applied Chemistry (1993). Quantities, Units and Symbols in Physical Chemistry, 2nd edition, Oxford: Blackwell Science. ISBN 0-632-03583-8. pp. 14–15. Electronic version.