mhon.
/məʊ/, U.S. /moʊ/ The cgs unit of electrical conductance, equal to the conductance of a body with a resistance of one ohm; a reciprocal ohm. Cf. Siemens n. 6.A resistance of R ohms is equivalent to a conductance of 1/R mhos.
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the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > [noun] > science of measuring > unit of
mho1884
Siemens1935
1884 W. Thomson Pract. Appl. Electr. (Inst. Civil Engineers) 172 Such an instrument at once gives conductivity, and you want a name (suppose you adopt mho) for the unit of conductivity, and call the instrument a mhometer... The number of mhos, or of millimhos will..measure the number of lamps in circuit.
1884 Proc. Philos. Soc. Glasgow 15 90 [W. Thomson] repeated a suggestion which he had made in his lecture on ‘Electrical Units of Measurements’, delivered before the Institute of Civil Engineers..on 3rd May, 1883, that the name ‘mho’ might be adopted for the unit of conductivity corresponding to the resistance of one ohm.
1928 R. Bradfield & W. J. John Telephone & Power Transmission ii. 18 Since the insulation of the circuit..can never be perfect, there must be a certain leakance from wire to wire,..stated in ‘mhos’, or sometimes in ‘micro-mhos’ per mile of loop.
1971 F. A. Bettelheim Exper. Physical Chem. xi. 329 The conductance of the water should be less that 5×10−6 mhos.
1994 Guardian 16 June (OnLine section) 4/1 This gave the diode a negative slope conductance of typically 0.006 mho and a very fast switching capability.
Compounds
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the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > [noun] > science of measuring > instrument
conductometera1884
mhometer1884
1884 W. Thomson Pract. Appl. Electr. (Inst. Civil Engineers) 172 Suppose you..call the instrument a mhometer.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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n.1884