Elastance
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
| Symbol[1] | Name of quantity | Unit name | Symbol | Base units |
|---|---|---|---|---|
| E | energy | joule | J = C⋅V = W⋅s | kg⋅m2⋅s−2 |
| Q | electric charge | coulomb | C | A⋅s |
| I | electric current | ampere | A = C/s = W/V | A |
| J | electric current density | ampere per square metre | A/m2 | A⋅m−2 |
| U, ΔV; Δϕ; E, ξ | potential difference; voltage; electromotive force | volt | V = J/C | kg⋅m2⋅s−3⋅A−1 |
| R; Z; X | electric resistance; impedance; reactance | ohm | Ω = V/A | kg⋅m2⋅s−3⋅A−2 |
| ρ | resistivity | ohm metre | Ω⋅m | kg⋅m3⋅s−3⋅A−2 |
| P | electric power | watt | W = V⋅A | kg⋅m2⋅s−3 |
| C | capacitance | farad | F = C/V | kg−1⋅m−2⋅A2⋅s4 |
| ΦE | electric flux | volt metre | V⋅m | kg⋅m3⋅s−3⋅A−1 |
| E | electric field strength | volt per metre | V/m = N/C | kg⋅m⋅A−1⋅s−3 |
| D | electric displacement field | coulomb per square metre | C/m2 | A⋅s⋅m−2 |
| ε | permittivity | farad per metre | F/m | kg−1⋅m−3⋅A2⋅s4 |
| χe | electric susceptibility | (dimensionless) | 1 | 1 |
| p | electric dipole moment | coulomb metre | C⋅m | A⋅s⋅m |
| G; Y; B | conductance; admittance; susceptance | siemens | S = Ω−1 | kg−1⋅m−2⋅s3⋅A2 |
| κ, γ, σ | conductivity | siemens per metre | S/m | kg−1⋅m−3⋅s3⋅A2 |
| B | magnetic flux density, magnetic induction | tesla | T = Wb/m2 = N⋅A−1⋅m−1 | kg⋅s−2⋅A−1 |
| Φ, ΦM, ΦB | magnetic flux | weber | Wb = V⋅s | kg⋅m2⋅s−2⋅A−1 |
| H | magnetic field strength | ampere per metre | A/m | A⋅m−1 |
| F | magnetomotive force | ampere | A = Wb/H | A |
| R | magnetic reluctance | inverse henry | H−1 = A/Wb | kg−1⋅m−2⋅s2⋅A2 |
| P | magnetic permeance | henry | H = Wb/A | kg⋅m2⋅s–2⋅A–2 |
| L, M | inductance | henry | H = Wb/A = V⋅s/A | kg⋅m2⋅s−2⋅A−2 |
| μ | permeability | henry per metre | H/m | kg⋅m⋅s−2⋅A−2 |
| χ | magnetic susceptibility | (dimensionless) | 1 | 1 |
| m | magnetic dipole moment | ampere square meter | A⋅m2 = J⋅T−1 | A⋅m2 |
| σ | mass magnetization | ampere square meter per kilogram | A⋅m2/kg | A⋅m2⋅kg−1 |
See also
References
- ^ International Union of Pure and Applied Chemistry (1993). Quantities, Units and Symbols in Physical Chemistry, 2nd edition, Oxford: Blackwell Science. ISBN 0-632-03583-8. pp. 14–15. Electronic version.
External links
Look up elastance in Wiktionary, the free dictionary.