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back-electro-motive force
back-electro-motive force n. 
/ˈˌbækiˌlɛktroʊˌmoʊdɪv ˈfɔrs/ (also back e.m.f) in Electrical Engineering, an electro-motive force which opposes that producing the current.
Brit. /ˌbakᵻˌlɛktrə(ʊ)ˌməʊtɪv ˈfɔːs/
, /ˌbakᵻˌlɛktrə(ʊ)ˌməʊtɪv ˈfɔːs/U.S. /ˈˌbækəˌlɛktroʊˌmoʊdɪv ˈfɔrs/
, /ˈˌbækəˌlɛktroʊˌmoʊdɪv ˈfɔrs//ˈˌbækiˌlɛktroʊˌmoʊdɪv ˈfɔrs/ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > voltage > [noun] > opposing current
back-electro-motive force1895
1895 Rutherford in Trans. & Proc. N.Z. Inst. 1895 (1896) 28 190 Since dN/dt may be called the back E.M.F. in the circuit at any instant.
1898 T. O'C. Sloane Standard Electr. Dict. 156 Counter-electro-motive Force..Synonym—Back Electro-motive Force.
1898 T. O'C. Sloane Standard Electr. Dict. 156 Back Electro-motive Force of Polarization.
1901 Geipel & Kilgour Electr. Engin. Formulæ (ed. 2) 668 When the anode and cathode are of the same metal..there is no back E.M.F., for the back E.M.F. at the one electrode is of opposite sign to that at the other, and they cancel one another.
1936 Discovery July 202/2 In the very small fraction of a second that the current is flowing in one direction, the back electro-motive force which opposes it has not time to form.
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