This list of electrical constants represent the most common values used in engineering, physics, and chemistry.

If you know of others that should be added, please send me an e-mail.

* : Reduced Planck constant, = h/2π
† : Atomic Units

Visit NIST for all constants, units, and uncertainties.   This is their Extensive Listing of constants.

Name	Symbol	Value
Boltzmann	k	8.617 343 x 10-5 eV (molecule·K) 1.380 650 5 x 10-23  J/K
Charge Density†		1.081 202 317 x 1012  C/m3
Conductance Quantum	G0	7.748 091 733 x 10-5  S
Current†		6.623 617 82 x 10-3  Ω
Electron Charge/Mass Ratio	e/me	1.758 820 12 x 1011  C/kg
Electric Dipole Moment†		8.478 353 09 x 10-30  C·m
Electric Field†		5.142 206 42 x 1011  V/m
Electric Field Gradient†		9.717 361 82 x 1021  V/m2
Electric Potential†		27.211 384 5  V
Electric Quadrupole Moment†		4.486 551 24 x 10-40  m2
Electron Volt	eV	1.602 176 53 x 10-19  J
Elementary Charge	e	1.602 176 53 x 10-19  C
Impedance of Free Space	Z0	376.730 313 461 (120·π)  Ω
Josephson	KJ	2.350 517 42 x 105  T
Magnetic Flux Quantum	Φ0	2.067 833 72 x 10-15  Wb
Magnetic Flux Density†		4.486 551 24 x 10-40  C·m2
Magnetizability†		7.891 036 60 x 10-29  J/T2
Magnetic Flux Dipole Moment†		1.854 801 90 x 10-23  J/T
Permeability of Free Space	μ0	1.256 637 061 4 x 10-6  H/m (N/A2)
Permittivity of Free Space	ε0	8.854 187 817 x 10-12  F/m
Planck *	h	4.135 667 43 x 10-15  eV·s 6.626 069 3 x 10-34  J·s
von Klitzing	RK	25 812.807 449  Ω