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SUMMARY OF KEY QUANTITIES, SYMBOLS AND UNITS (cont’d)

Quantity Usual Symbols Usual Unit

Other Quantities (cont’d)

electric charge Q C

elementary charge e C

electric potential V V

electric potential difference V V

electromotive force E V

resistance R Ω

resistivity ρ Ω m

-1
electric field strength E N C , V m -1

permittivity of free space ε0 F m -1

capacitance C F

time constant τ s

magnetic flux Φ Wb

magnetic flux density Β T

permeability of free space µ0 H m -1

stress σ Pa

strain ε

force constant k N m -1

Young modulus Ε Pa

Celsius temperature θ °C

-1
molar gas constant R J K mol -1

-1
Boltzmann constant k J K

CXC A16/U2/17 108