Daraf

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(′da′raf)

(electricity) The unit of elastance, equal to the reciprocal of 1 farad.


[Etymology: reverse spelling of farad] electric elastance (Metric) The elastance of a circuit in darafs equals the reciprocal of its capacitance in farads, so, for a steady current, equals the ratio of the rise in the potential produced between its plates in volts to the applied charge in coulombs.

Metric-m.k.s. (symbol usually D) F-1 = V·C-1, identically V·(A·s)-1 and J·C-2(= m2·kg1·s-4·A-2 in base terms).

Metric-c.g.s. See abdaraf; statdaraf. See also practical unit.

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pronunciation

IN BRIEF: n. - A unit of elastance equal to the reciprocal of a unit of capacitance in the meter-kilogram-second system

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The daraf is the unit of electrical elastance (symbol: F−1), the voltage across a capacitor after accepting an electric charge of 1 coulomb; it is the reciprocal of the farad. Proposed by Arthur Edwin Kennelly in 1936 as a backwards spelling (semordnilaps) of farad, the term daraf is not recognized by the SI (the preferred term being reciprocal farad).

1 F^{-1} = \frac{1 V}{1 C}

See also

References

  • Journal of the Institute of Electrical Engineers (GB) volume 78, page 241 (1936).



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statdaraf (electric elastance)
abdaraf (electric elastance)