ABSTRACT
Admittance Y siemen S Angular frequency ω radians per second rad/s Area A square metres m2 Attenuation coefficient
(or constant) ˛ neper per metre Np/m
Capacitance C farad F Charge Q coulomb C Charge density coulomb per square
metre C/m2
Conductance G siemen S Current I ampere A Current density J ampere per square
metre A/m2
Efficiency per-unit or per cent p.u. or % Electric field strength E volt per metre V/m Electric flux 9 coulomb C Electric flux density D coulomb per square
metre C/m2
Electromotive force E volt V Energy W joule J Field strength, electric E volt per metre V/m Field strength, magnetic H ampere per metre A/m Flux, electric 9 coulomb C Flux, magnetic 8 weber Wb Flux density, electric D coulomb per square
metre C/m2
Flux density, magnetic B tesla T Force F newton N Frequency f hertz Hz Frequency, angular ω radians per second rad/s Frequency, rotational n revolutions per
second rev/s
Impedance Z ohm Inductance, self L henry H
QUANTITY UNIT QUANTITY SYMBOL UNIT SYMBOL
Inductance, mutual M henry H length l metre m Loss angle υ radian or degrees rad or ° Magnetic field strength H ampere per metre A/m Magnetic flux 8 weber Wb Magnetic flux density B tesla T Magnetic flux linkage 9 weber Wb Magnetising force H ampere per metre A/m Magnetomotive force Fm ampere A Mutual inductance M henry H Number of phases m
–
–
Number of pole-pairs p –
–
Number of turns (of a winding)
N –
–
Period, Periodic time T second s Permeability, absolute henry per metre H/m Permeability of free
space 0 henry per metre H/m
Permeability, relative r –
–
Permeance 3 weber per ampere Wb/A or or per henry /H
Permittivity, absolute ε farad per metre F/m Permittivity of free
space ε0 farad per metre F/m
Permittivity, relative εr –
–
Phase-change coefficient
ˇ radian per metre rad/m
Potential, Potential difference
V volt V
Power, active P watt W Power, apparent S volt ampere VA Power, reactive Q volt ampere reactive var Propagation coefficient
(or constant)
–
–
Quality factor, magnification
Q –
–
Quantity of electricity Q coulomb C Reactance X ohm Reflection coefficient
–
–
Relative permeability r –
–
Relative permittivity εr –
–
Reluctance Rm ampere per weber or A/Wb or per henry /H
Resistance, temperature coefficient of
˛ per degree Celsius or per kelvin
/°C or/K
Resistivity ohm metre m Slip s per unit or per cent p.u. or % Standing wave ratio s
–
–
Susceptance B siemen S Temperature coefficient
of resistance ˛ per degree Celsius
or per kelvin /°C or/K
Temperature, thermodynamic
T kelvin K
Time t second s Torque T newton metre Nm Velocity v metre per second m/s Velocity, angular ω radian per second rad/s Volume V cubic metres m3 Wavelength metre m
