Electrical elastance is the inverse of capacitance. The SI unit is the reciprocal farad. Although the term daraf is sometimes used, this is not approved by SI. Electrical inductor-capacitor-resistor circuits can be converted to mass-spring-damper systems. If voltage is taken to be force and current velocity, elastance corresponds to the elastic constant of a spring.

SI electricity units

SI electromagnetism units edit  (http://www.wordiq.com/definition/Template:SI_electromagnetism_units)
Name	Symbol	Dimensions	Quantity
ampere (SI base unit)	A	A	Current
coulomb	C	A·s	Electric charge, Quantity of electricity
volt	V	J/C = kg·m2·s−3·A−1	Potential difference
ohm	Ω	V/A = kg·m2·s−3·A−2	Resistance, Impedance, Reactance
ohm metre	Ω·m	kg·m3·s−3·A−2	Resistivity
farad	F	C/V = kg−1·m−2·A2·s4	Capacitance
farad per metre	F/m	kg−1·m−3·A2·s4	Permittivity
reciprocal farad	F−1	kg1·m2·A−2·s−4	Elastance
siemens	S	Ω−1 = kg−1·m−2·s3·A2	Conductance, Admittance, Susceptance
siemens per metre	S/m	kg−1·m−3·s3·A2	Conductivity
weber	Wb	V·s = kg·m2·s−2·A−1	Magnetic flux
tesla	T	Wb/m2 = kg·s−2·A−1	Magnetic flux density
ampere per metre	A/m	m−1·A	magnetic induction
ampere-turns per weber	A/Wb	kg−1·m−2·s2·A2	Reluctance
henry	H	V·s/A = kg·m2·s−2·A−2	Inductance
henry per metre	H/m	kg·m·s−2·A−2	Permeability
(dimensionless)	-	-	Magnetic susceptibility

See also

• harmonic oscillator