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 (semordnilap) of farad, the term daraf is not recognized by the SI (the preferred term being reciprocal farad).
- Journal of the Institute of Electrical Engineers (GB) volume 78, page 241 (1936).
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