ohm
nounUK /əʊm/ · US /oʊm/
Etymology Named after Bavarian physicist Georg Ohm. A German surname, first recorded in the 12th century, from German Ohm (“uncle”), from Proto-West Germanic *auhaim (“maternal uncle”), from or related to Proto-Germanic *awô (“grandfather, paternal uncle”) + *haimaz (“home”). Doublet of oom and of dialectal eam (“uncle”).
1
In the International System of Units, the derived unit of electrical resistance; the electrical resistance of a device across which a potential difference of one volt causes a current of one ampere.
- If the volt, ampere and ohm were taken as the absolute units, the practical units would be the ampere, begohm and begavolt, names just as convenient as ampere, coulomb and farad.1900, Journal of the Franklin Institute, volume 149, page 461:
- As the test light voltage touches terminal "C7", the module should switch, causing the ohmmeter to "overrange" if the meter is in the 1000-2000 ohms position.1992, Chilton's General Motors, page 7: