Unit

Symbol

General Quantities

m/s^{2} (metre/second/second)

a

Acceleration, linear

m^{2} (square
metre)

A

Area

J (joule)

W

Energy or work

N (newton)

F

Force

m (meter)

l

Length

kg (kilogram)

m

Mass

W (watt)

P

Power

Pa (pascal)

p

Pressure

K or °C (Kelvin or degree Celsius)

θ

Temperature value

s (second)

t

Time

Nm (newton metre)

T

Torque

rad/s (radian/second)

ω

Velocity, angular

m/s (metre/second)

v or u

Velocity, linear

m^{3} (cubic
metre)

V

Volume

m meter

λ

Wavelength

Unit

Symbol

Electrical Quantities

Ω(ohm)

Y

Admittance

C (coulomb)

Q

Charge (quantity)

S (siemen)

G

Conductance

A (ampere)

I

Current

A/m^{2} (ampere/square
metre)

J

Current density

V (volts)

E

Electromotive force (emf)

Hz (hertz)

f

Frequency

Ω (ohm)

Z

Impedance

s (second)

T

Period

V (volt)

V

Potential difference (p.d.)

W (watt)

P

Power, active

VA (volt ampere)

S

Power, apparent

VAr (volt ampere reactive)

Q

Power, reactive

Ω (ohm)

X

Reactance

Ω (ohm)

R

Resistance

Ωm (ohm metre)

ρ

Resistivity

s (second)

t

Time constant

Unit

Symbol

Electrostatic Quantities

F (farad)

C

Capacitance

V/m (volt/metre)

E

Field strength

C (coulomb)

Ψ

Flux

C/m^{2} (coulomb/square
metre)

D

Flux density

F/m (farad/metre)

ε

Permittivity, absolute

Unit

Symbol

General
Quantities

no units

ε_{r}

Permittivity,
relative

F/m
(farad/metre)

ε_{0}

Field
strength

Unit

Symbol

Electromagnetic Quantities

At/m (ampere turn/metre)

H

Field strength

Wb (weber)

Φ

Flux

T (tesla)

B

Flux density

H (henry)

M

Inductance, mutual

H (henry)

L

Inductance, self

A/t (ampereturn)

F

Magnetomotive force (mmf)

H/m (henry/metre)

μ

Permeability, absolute

no units

μ_{r}

Permeability, relative

H/m (henry/metre)

μ_{0}

Permeability, of free space

At/Wb (ampere turn/weber)

S

Reluctance

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