Ohm
[əʊm] or [om]
Definition
(noun.) German physicist who formulated Ohm's law (1787-1854).
(noun.) a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere.
Edited by Kelsey--From WordNet
Definition
(n.) The standard unit in the measure of electrical resistance, being the resistance of a circuit in which a potential difference of one volt produces a current of one ampere. As defined by the International Electrical Congress in 1893, and by United States Statute, it is a resistance substantially equal to 109 units of resistance of the C.G.S. system of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice 14.4521 grams in mass, of a constant cross-sectional area, and of the length of 106.3 centimeters. As thus defined it is called the international ohm.
Typist: Sonia
Definition
n. the unit by which electrical resistance is measured being nearly equal to that caused by a thousand feet of copper wire one-tenth of an inch in diameter.—Ohm's law (see Law).
Edited by Anselm
Examples
- Tried a 6-ohm spool add a 200-ohm. Frank Lewis Dyer. Edison, His Life and Inventions.
- As regards loss due to resistance, there is a well-known law for determining it, based on Ohm's law. Frank Lewis Dyer. Edison, His Life and Inventions.
- It is stated that 'the internal resistance of the armature' of this machine 'is only 1/2 ohm. Frank Lewis Dyer. Edison, His Life and Inventions.
- Ampere would be the quantity, or volume unit, or cross section of the hose pipe, and the ohm would be the unit of frictional resistance. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- An approximate ohm for rough work in the laboratory may be made by winding 9 feet 5 inches of number 30 copper wire on a spool or arranging it in any other convenient form. Bertha M. Clark. General Science.
- What I was after was getting a high-resistance lamp, and I made one that way that worked up to forty ohms. Rupert S. Holland. Historic Inventions.
- Or the same given battery will bring a wire whose total resistance is 4 ohms to the same temperature as straight wire. Frank Lewis Dyer. Edison, His Life and Inventions.
- It lit up, and in the first few breathless minutes we measured its resistance quickly and found it was 275 ohms--all we wanted. Rupert S. Holland. Historic Inventions.
- We put in resistance up to 500,000 ohms, and the twitching was still perceptible. Frank Lewis Dyer. Edison, His Life and Inventions.
- By increasing the battery from eight to twelve cells we get a spark when the vibrating magnet is shunted with 3 ohms. Frank Lewis Dyer. Edison, His Life and Inventions.
Editor: Rhoda