Ohm

Definition

The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt (V), applied to these points, produces in the conductor a current of one ampere (A), the conductor not being the seat of any electromotive force. : \Omega = \frac{\mathrm{V}}{\mathrm{A}} = \frac{1}{\mathrm{S}} = \frac{\mathrm{W}}{\mathrm{A^{2}}} = \frac{\mathrm{V}^{2}}{\mathrm{W}} = \frac{\mathrm{s}}{\mathrm{F}} = \frac{\mathrm{H}}{\mathrm{s}} = \frac{\mathrm{Wb}}{\mathrm{C}} = \frac{\mathrm{J{\cdot}s}}{\mathrm{C^{2}}} = \frac{\mathrm{J}}{\mathrm{s{\cdot}A^{2}}} = \frac{\mathrm{kg{\cdot}m^{2}}}{\mathrm{s{\cdot}C^{2}}} = \frac{\mathrm{kg{\cdot}m^{2}}}{\mathrm{s^{3}{\cdot}A^{2}}}

In many cases the resistance of a conductor is approximately constant within a certain range of voltages, temperatures, and other parameters. These are called linear resistors. In other cases resistance varies, such as in the case of the thermistor, which exhibits a strong dependence of its resistance with temperature.

In the US, consecutive vowels in the prefixed units "kiloohm" and "megaohm" are commonly reduced to one, producing "kilohm" and "megohm".[[File:Electronic multi meter.jpg|thumb|One of the functions of many types of [[multimeter]]s is the measurement of resistance in ohms.]]

In alternating current circuits, electrical impedance is also measured in ohms.

Relation to conductance

The siemens (S) is the SI derived unit of electric conductance and admittance, historically known as the "mho" (ohm spelled backwards, symbol is ℧); it is one reciprocal ohm:

Power as a function of resistance

The power dissipated by a resistor may be calculated from its resistance, and the voltage or current involved. The formula is a combination of Ohm's law and Joule's law: P=V I =\frac{V^2}{R} = I^2 R,

where P is the power, R is the resistance, V is the voltage across the resistor, and I is the current through the resistor.

A linear resistor has a constant resistance value over all applied voltages or currents; many practical resistors are linear over a useful range of currents. Non-linear resistors have a value that may vary depending on the applied voltage (or current). Where alternating current is applied to the circuit (or where the resistance value is a function of time), the relation above is true at any instant, but calculation of average power over an interval of time requires integration of "instantaneous" power over that interval.

Since the ohm belongs to a coherent system of units, when each of these quantities has its corresponding SI unit (watt for P, ohm for R, volt for V and ampere for I, which are related as in ) this formula remains valid numerically when these units are used (and thought of as being cancelled or omitted).

History

The rapid rise of electrotechnology in the last half of the 19th century created a demand for a rational, coherent, consistent, and international system of units for electrical quantities. Telegraphers and other early users of electricity in the 19th century needed a practical standard unit of measurement for resistance. Resistance was often expressed as a multiple of the resistance of a standard length of telegraph wires; different agencies used different bases for a standard, so units were not readily interchangeable. Electrical units so defined were not a coherent system with the units for energy, mass, length, and time, requiring conversion factors to be used in calculations relating energy or power to resistance.

Two different methods of establishing a system of electrical units can be chosen. Various artifacts, such as a length of wire or a standard electrochemical cell, could be specified as producing defined quantities for resistance, voltage, and so on. Alternatively, the electrical units can be related to the mechanical units by defining, for example, a unit of current that gives a specified force between two wires, or a unit of charge that gives a unit of force between two unit charges. This latter method ensures coherence with the units of energy. Defining a unit for resistance that is coherent with units of energy and time in effect also requires defining units for potential and current. It is desirable that one unit of electrical potential will force one unit of electric current through one unit of electrical resistance, doing one unit of work in one unit of time, otherwise, all electrical calculations will require conversion factors.

Since so-called "absolute" units of charge and current are expressed as combinations of units of mass, length, and time, dimensional analysis of the relations between potential, current, and resistance show that resistance is expressed in units of length per time – a velocity. Some early definitions of a unit of resistance, for example, defined a unit resistance as one quadrant of the Earth per second.

The absolute-unit system related magnetic and electrostatic quantities to metric base units of mass, time, and length. These units had the great advantage of simplifying the equations used in the solution of electromagnetic problems, and eliminated conversion factors in calculations about electrical quantities. However, the centimeter–gram–second, CGS, units turned out to have impractical sizes for practical measurements.

Various artifact standards were proposed as the definition of the unit of resistance. In 1860 Werner Siemens (1816–1892) published a suggestion for a reproducible resistance standard in Poggendorff's Annalen der Physik und Chemie. He proposed a column of pure mercury, of one square millimeter cross section, one meter long: Siemens mercury unit. However, this unit was not coherent with other units. One proposal was to devise a unit based on a mercury column that would be coherent – in effect, adjusting the length to make the resistance one ohm. Not all users of units had the resources to carry out metrology experiments to the required precision, so working standards notionally based on the physical definition were required.

In 1861, Latimer Clark (1822–1898) and Sir Charles Bright (1832–1888) presented a paper at the British Association for the Advancement of Science meeting {{cite journal |access-date= 27 February 2014 |access-date= 27 February 2014 |access-date= 27 February 2014

The B.A. ohm was intended to be 109 CGS units but owing to an error in calculations the definition was 1.3% too small. The error was significant for preparation of working standards.

On 21 September 1881 the International Electrical Congress defined a practical unit of ohm for the resistance, based on CGS units, using a mercury column 1 mm2 in cross-section, approximately 104.9 cm in length at 0 °C, similar to the apparatus suggested by Siemens.

A legal ohm, a reproducible standard, was defined by the international conference of electricians at Paris in 1884 as the resistance of a mercury column of specified weight and 106 cm long; this was a compromise value between the B. A. unit (equivalent to 104.7 cm), the Siemens unit (100 cm by definition), and the CGS unit. Although called "legal", this standard was not adopted by any national legislation. The "international" ohm was recommended by unanimous resolution at the International Electrical Congress 1893 in Chicago. The mercury column standard was maintained until the 1948 General Conference on Weights and Measures, at which the ohm was redefined in absolute terms instead of as an artifact standard.

By the end of the 19th century, units were well understood and consistent. Definitions would change with little effect on commercial uses of the units. Advances in metrology allowed definitions to be formulated with a high degree of precision and repeatability.

Historical units of resistance

Realization of standards

The mercury column method of realizing a physical standard ohm turned out to be difficult to reproduce, owing to the effects of non-constant cross section of the glass tubing. Various resistance coils were constructed by the British Association and others, to serve as physical artifact standards for the unit of resistance. The long-term stability and reproducibility of these artifacts was an ongoing field of research, as the effects of temperature, air pressure, humidity, and time on the standards were detected and analyzed.

Artifact standards are still used, but metrology experiments relating accurately dimensioned inductors and capacitors provided a more fundamental basis for the definition of the ohm. Since 1990 the quantum Hall effect has been used to define the ohm with high precision and repeatability. The quantum Hall experiments are used to check the stability of working standards that have convenient values for comparison.

Following the 2019 revision of the SI, in which the ampere and the kilogram were redefined in terms of fundamental constants, the ohm is now also defined in terms of these constants.

Symbol

The symbol Ω was suggested, because of the similar sound of ohm and omega, by William Henry Preece in 1867. In documents printed before the Second World War the unit symbol often consisted of the raised lowercase omega (ω), such that 56 Ω was written as 56ω.

Historically, some document editing software applications have used the Symbol typeface to render the character Ω. Where the font is not supported, the same document may be displayed with a "W" ("10 W" instead of "10 Ω", for instance). As W represents the watt, the SI unit of power, this can lead to confusion, making the use of the correct Unicode code point preferable.

Where the character set is limited to ASCII, the IEEE 260.1 standard recommends using the unit name "ohm" as a symbol instead of Ω.

In the electronics industry it is common to use the character R instead of the Ω symbol, thus, a 10 Ω resistor may be represented as 10R. This is part of the RKM code. It is used in many instances where the value has a decimal place. For example, 5.6 Ω is listed as 5R6, or 2200 Ω is listed as 2K2. This method avoids overlooking the decimal point, which may not be rendered reliably on components or when duplicating documents.

Unicode encodes the symbol as , distinct from Greek omega among letterlike symbols, but it is only included for backward compatibility and the Greek uppercase omega character is preferred. In MS-DOS and Microsoft Windows, the alt code ALT 234 may produce the Ω symbol. In Mac OS, does the same.

References

1. (May 1884). "The Electrical Congress Of Paris, 1884". Nature.
2. The unit was based upon the ohm equal to 10⁹ units of resistance of the C.G.S. system of electromagnetic units. The international ohm is represented by the resistance offered to an unvarying electric current in a mercury column of constant cross-sectional area 106.3 cm long of mass 14.4521 grams and 0 °C. This definition became the basis for the legal definition of the ohm in several countries. In 1908, this definition was adopted by scientific representatives from several countries at the International Conference on Electric Units and Standards in London.{{cite EB1911|wstitle= Units, Physical |volume= 27 | pages = 738–745; see page 742| quote= An Electrical Congress was held in Chicago, U.S.A. in August 1893, to consider......and at the last one held in London in October 1908 were finally adopted|last1= Fleming |first1= John Ambrose |author-link= John Ambrose Fleming }}
3. Gordon Wigan (trans. and ed.), ''Electrician's Pocket Book'', Cassel and Company, London, 1884
4. [https://books.google.com/books?id=OkxGT9mfNGkC&dq=%22Siemens+mercury+unit%22&pg=PA32 Historical Studies in International Corporate Business. Teich p34]
5. R. Dzuiba and others, ''Stability of Double-Walled Maganin Resistors'' in ''NIST Special Publication Proceedings of SPIE'', The Institute, 1988 pp. 63–64
6. (1867). "The B.A. unit for electrical measurements".
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8. Excerpts from ''[https://www.unicode.org/versions/Unicode4.0.0/ch07.pdf#search=%22character%20U%2B2126%20maps%20OR%20map%20OR%20mapping%22 The Unicode Standard, Version 4.0]'', accessed 11 October 2006
9. [https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf BIPM SI Brochure: Appendix 1, p.46 (pdf)]
10. (1994). "The Ohm Is Where the Art Is: British Telegraph Engineers and the Development of Electrical Standards". Osiris.
11. (2016-08-25). "NIST Guide to the SI". [[National Institute of Standards and Technology]] (NIST), Physical Measurement Laboratory.
12. (November 2008). "Guide for the Use of the International System of Units (SI)". [[National Institute of Standards and Technology]], U.S. Department of Commerce.
13. (2002-12-30). "IEEE/ASTM SI 10-2002: IEEE/ASTM Standard for Use of the International System of Units (SI): The Modern Metric System.". IEEE SA.
14. (2012-01-20). "About the International System of Units (SI) Part IV. Writing, Spelling, and Mathematics". [[The Physics Teacher]].
15. (1860). "Vorschlag eines reproducirbaren Widerstandsmaaßes".