"inductor: where ""V""(""t"") denotes the resulting voltage across the circuit, ""I""(""t"") is the current through the circuit, and ""L"" is the inductance of the circuit. The henry is a derived unit based on four of the seven base units of the International System of Units: kilogram (kg), metre (m), second (s), and ampere (A). Expressed in combinations of SI units, the henry is: in which the following additional derived units occur: coulomb (C), farad (F), joule (J), weber (Wb), tesla (T), volt (V), hertz (Hz), and ohm (Ω). The International System of Units (SI) specifies to write the symbol of"
"with the convention for pronouncing SI units in English, places the stress on the first syllable. The plural of ""micron"" is normally ""microns"", though ""micra"" was occasionally used before 1950. The official symbol for the SI prefix ""micro-"" is a Greek lowercase mu (μ). In Unicode, there is also a micro sign with the code point U+00B5 (µ), distinct from the code point U+03BC (μ) of the Greek letter lowercase mu, so that machines can recognize it as the SI prefix symbol rather than as a letter. According to the Unicode Consortium, the Greek letter character is preferred, but implementations"
"Examples: The official symbol for the SI prefix ""micro-"" is a Greek lowercase mu (μ). For reasons stemming from its design, there are two different characters in Unicode, which appear slightly different in some fonts, although most fonts use the same glyph. The micro sign (µ) is encoded in the ""Latin-1 Supplement"" range identical to ISO/IEC 8859-1 (since 1987), at codice_1 (), residing at this code point also in DEC MCS (since 1983) and ECMA-94 (since 1985). The Greek letter (μ) is encoded in the Greek range at codice_2 (). According to The Unicode Consortium, the Greek letter character is"
"Psi (letter) Psi (; uppercase ', lowercase '; ""psi"" ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination /ps/ (as in English word ""lapse""). For Greek loanwords in Latin and modern languages with Latin alphabets, psi is usually transliterated as ""ps"". The letter's origin is uncertain. It may or may not derive from the Phoenician alphabet. It appears in the 7th century BC, expressing /ps/ in the Eastern alphabets, but /kʰ/ in the Western alphabets (the sound expressed by Χ in the"
"the 6th letter of the modern and classical Greek alphabet, denotes a value of seven (7) when used as a numeral. Examples: Zetta- Zetta is a decimal unit prefix in the metric system denoting a factor of 10 or . The prefix was added as an SI prefix to the International System of Units (SI) in 1991 and has the symbol Z. Zetta is evocative of the Latin numeral , meaning ""seven"". Therefore it was used to denote the seventh power of 1000. A prefix of the same value, ""hepta"", was informally introduced a few years before the promulgation of"
"m), the SI derived unit of density. The names of SI derived units, when written in full, are in lowercase. However, the symbols for units named after persons are written with an uppercase initial letter. For example, the symbol for hertz is ""Hz""; but the symbol for metre is ""m"". The International System of Units assigns special names to 22 derived units, which includes two dimensionless derived units, the radian (rad) and the steradian (sr). Some other units such as the hour, litre, tonne, bar and electronvolt are not SI units, but are widely used in conjunction with SI units."
"where the value has a decimal place. For example, 5.6 Ω is listed as 5R6. 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 backwards compatibility and the Greek uppercase omega character is preferred. In DOS and Windows, the alt code ALT 234 may produce the Ω symbol. In Mac OS, does the same. Ohm The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist"
"Siemens (unit) The siemens (symbol: S) is the derived unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is redundantly equal to the reciprocal of one ohm, and is also referred to as the ""mho"". The 14th General Conference on Weights and Measures approved the addition of the siemens as a derived unit in 1971. The unit is named after Ernst Werner von Siemens. In English, the same form ""siemens"" is used both for the singular and"
"name ""katal"" has been used for decades, and the unit became an official SI unit in 1999. The name comes from the Ancient Greek κατάλυσις (""katalysis""), meaning ""dissolution"", which is the same origin as the word ""catalysis"" itself comes from. Katal The katal (symbol: kat) is the unit of catalytic activity in the International System of Units (abbreviated SI). It is a derived SI unit for quantifying the catalytic activity of enzymes (that is, measuring the enzymatic activity level in enzyme catalysis) and other catalysts. The General Conference on Weights and Measures and other international organizations recommend use of the"
"(generalized) positional states of a qubit in a quantum computer. Psi is also used as the symbol for the polygamma function, defined by where formula_3 is the gamma function. The letters Ψ or ψ can also be a symbol for: These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style. Psi (letter) Psi (; uppercase ', lowercase '; ""psi"" ) is the 23rd letter of the Greek alphabet and has a numeric value of 700. In both Classical and Modern Greek, the letter"
"Xi (letter) Xi (uppercase Ξ, lowercase ξ; ) is the 14th letter of the Greek alphabet. It is pronounced in Modern Greek, and generally or in English. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh . Xi is not to be confused with the letter chi, which gave its form to the Latin letter X. Both in classical Ancient Greek and in Modern Greek, the letter Ξ represents the sound . In some archaic local variants of the Greek alphabet, this letter was missing. Instead, especially in the"
"Upsilon Upsilon (; or ; uppercase Υ, lowercase υ; ""ýpsilon"" ) or ypsilon is the 20th letter of the Greek alphabet. In the system of Greek numerals, has a value of 400. It is derived from the Phoenician waw . The name of the letter was originally just “υ” (""y;"" also called ""hy"", hence ""hyoid"", meaning ""shaped like the letter υ""), but the name changed to “υ ψιλόν”, (""u psilon"", meaning 'simple u') to distinguish it from οι, which had come to have the same pronunciation. In early Greek it was pronounced like English ""oo"" . In Classical Greek, it"
"Micro- Micro- (Greek letter μ or legacy micro symbol µ) is a unit prefix in the metric system denoting a factor of 10 (one millionth). Confirmed in 1960, the prefix comes from the Greek (""""), meaning ""small"". The symbol for the prefix comes from the Greek letter μ (mu). It is the only SI prefix which uses a character not from the Latin alphabet. ""mc"" is commonly used as a prefix when the character ""μ"" is not available; for example, ""mcg"" commonly denotes a microgram. Also the letter u instead of μ is allowed by one of the ISO documents."
"others don't), and in physical sciences academia, ""μg"" remains the sole official abbreviation. In medical data exchange according to the Health Level 7 (HL7) standard, the μ can be replaced by u as well. Micro- Micro- (Greek letter μ or legacy micro symbol µ) is a unit prefix in the metric system denoting a factor of 10 (one millionth). Confirmed in 1960, the prefix comes from the Greek (""""), meaning ""small"". The symbol for the prefix comes from the Greek letter μ (mu). It is the only SI prefix which uses a character not from the Latin alphabet. ""mc"" is"
"on Units, considers the chances of official adoption to be remote. The prefix ""geop"" and term ""geopbyte"" has been used in the tech industry to refer to 10 bytes following ""brontobyte"". The ascending prefixes ""tera"" (), ""peta"" (), ""exa"" (), ""zetta"" (), and ""yotta"" () are based on the Greek-derived numeric prefixes ""tetra"" (4), ""penta"" (5), ""hexa"" (6), ""hepta"" (7), and ""octa"" or ""octo"" (8). In addition, the final letters of the alphabet, ""z"" and ""y"", appear in the largest SI prefixes, ""zetta"" and ""yotta"". Similarly, the descending prefixes ""zepto"" () and ""yocto"" () are derived from either Greek ""hepta"""
"Omicron Omicron (uppercase Ο, lowercase ο, literally ""small o"": όμικρον < ὂ μικρόν - ""ò mikrón"", micron meaning 'small' in contrast to ""omega"") is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70. This letter is derived from the Phoenician letter ayin . In classical Greek, omicron represented the sound in contrast to ""omega"" and ""ου"" . In modern Greek, omicron represents the . Letters that arose from omicron include Roman O and Cyrillic O. The upper-case letter of omicron (O) was originally used in mathematics as a symbol for"
"SI derived unit SI derived units are units of measurement derived from the seven base units specified by the International System of Units (SI). They are either dimensionless or can be expressed as a product of one or more of the base units, possibly scaled by an appropriate power of exponentiation. The SI has special names for 22 of these derived units (for example, hertz, the SI unit of measurement of frequency), but the rest merely reflect their derivation: for example, the square metre (m), the SI derived unit of area; and the kilogram per cubic metre (kg/m or kg"
"Epsilon Epsilon (uppercase ', lowercase ' or lunate ; ) is the fifth letter of the Greek alphabet, corresponding phonetically to a . In the system of Greek numerals it also has the value five. It was derived from the Phoenician letter He . Letters that arose from epsilon include the Roman E, Ë and Ɛ, and Cyrillic Е, È, Ё, Є and Э. The name of the letter was originally (), but the name was changed to (""e psilon"" ""simple e"") in the Middle Ages to distinguish the letter from the digraph , a former diphthong that had come"
"ε, the lunate epsilon symbol ϵ, or the Latin lowercase epsilon ɛ (see above) is used in a variety of places: These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style. Epsilon Epsilon (uppercase ', lowercase ' or lunate ; ) is the fifth letter of the Greek alphabet, corresponding phonetically to a . In the system of Greek numerals it also has the value five. It was derived from the Phoenician letter He . Letters that arose from epsilon include the Roman"
"letter Ef (Ф, ф) descends from phi. Phi is also used as a symbol for the golden ratio and on other occasions in math and science. This use is separately encoded as the Unicode glyph ϕ. The modern Greek pronunciation of the letter is sometimes encountered in English (as ) when the letter is being used in this sense. The lowercase letter φ (or often its variant, ϕ) is often used to represent the following: The uppercase letter Φ is used as a symbol for: The diameter symbol in engineering, ⌀, is often erroneously referred to as ""phi"". This symbol"
"has a symbol that is used in combination with the symbols for units of measure. For example, the symbol for ""kilo-"" is 'k', and is used to produce 'km', 'kg', and 'kW', which are the SI symbols for kilometre, kilogram, and kilowatt, respectively. Where the Greek letter 'μ' is unavailable, the symbol for micro 'µ' may be used. Where both variants are unavailable, the micro prefix is commonly written as the lowercase Latin letter 'u'. Prefixes corresponding to an integer power of one thousand are generally preferred. Hence ""100 m"" is preferred over ""1 hm"" (hectometre) or ""10 dam"" (decametres)."
"of Units (SI)"" refers to the mho as an ""unaccepted special name for an SI unit"", and indicates that it should be strictly avoided. The SI term ""siemens"" is used universally in science and often in electrical applications, while ""mho"" is still used in some electronic contexts. The inverted capital omega symbol, while not an official SI abbreviation, is less likely to be confused with a variable than the letter S when doing algebraic calculations by hand, where the usual typographical distinctions (such as italic for variables and Roman for unit names) are difficult to maintain. Likewise, it is difficult"
"Zetta- Zetta is a decimal unit prefix in the metric system denoting a factor of 10 or . The prefix was added as an SI prefix to the International System of Units (SI) in 1991 and has the symbol Z. Zetta is evocative of the Latin numeral , meaning ""seven"". Therefore it was used to denote the seventh power of 1000. A prefix of the same value, ""hepta"", was informally introduced a few years before the promulgation of zetta. It was formed from the Greek (), also meaning ""seven"". ""Hepta"" never received official sanction and is obsolete. Zeta (), although"
"the normalised impedance using the lower case ""z"" is given by Similarly, for normalised admittance The SI unit of impedance is the ohm with the symbol of the upper case Greek letter omega (Ω) and the SI unit for admittance is the siemens with the symbol of an upper case letter S. Normalised impedance and normalised admittance are dimensionless. Actual impedances and admittances must be normalised before using them on a Smith chart. Once the result is obtained it may be de-normalised to obtain the actual result. Using transmission line theory, if a transmission line is terminated in an impedance"
"""mcg"" rather than ""μg"" to represent ""micrograms"" in the pharmaceutical industry. There are three basic classes of units in SI: This article will not differentiate between these various classes of units, other than to make references to them as appropriate. The metre is the base unit of length. Its name was derived from the Greek (""métron katholikón""), ""a universal measure"". This word gave rise to the French ""mètre"" which was subsequently introduced into the English language. Originally the metre was to have been one ten millionth of the distance between the North Pole and the equator. The French Academy of"
"International System of Units The International System of Units (SI, abbreviated from the French "") is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units, which are the ampere, kelvin, second, metre, kilogram, candela, mole, and a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system also specifies names for 22 derived units, such as lumen and watt, for other common physical quantities."
"units are written in lowercase, except the symbols of those named after a person, which are written with an initial capital letter. For example, the ""metre"" (US English: ""meter"") has the symbol m, but the ""kelvin"" has symbol K, because it is named after Lord Kelvin and the ""ampere"" with symbol A is named after André-Marie Ampère. Several other units, such as the litre (US English: ""liter""), are formally not part of the SI, but are accepted for use with SI. New definitions of the base units were approved on 16 November 2018, to take effect 20 May 2019. The"
"include it among the ""Non-SI units accepted for use with the SI"". The bar has been legally recognised in countries of the European Union since 2004. The US National Institute of Standards and Technology (NIST) deprecates its use except for ""limited use in meteorology"" and lists it as one of several units that ""must not be introduced in fields where they are not presently used"". The International Astronomical Union (IAU) also lists it under ""Non-SI units and symbols whose continued use is deprecated"". Units derived from the bar include the megabar (symbol: Mbar), kilobar (symbol: kbar), decibar (symbol: dbar), centibar"
"the name ""upsilon"" (""Ypsilon"" in German, ""ípsilon"" in Portuguese) is used to refer to the Latin letter Y as well as the Greek letter. Upsilon is known as Pythagoras' letter, or the Samian letter, because Pythagoras used it as an emblem of the path of virtue or vice. As the Roman writer Persius wrote in ""Satire III"": Lactantius, an early Christian author (ca. 240 – ca. 320), refers to this: These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style. Upsilon Upsilon (;"
"Pi (letter) Pi (; uppercase Π, lowercase π and ϖ; ) is the sixteenth letter of the Greek alphabet, representing the sound . In the system of Greek numerals it has a value of 80. It was derived from the Phoenician letter Pe (). Letters that arose from pi include Cyrillic Pe (П, п), Coptic pi (Ⲡ, ⲡ), and Gothic pairthra (𐍀). The upper-case letter Π is used as a symbol for: The lower-case letter π is used as a symbol for: An early form of pi was , appearing almost like a gamma with a hook. Variant pi or"
"Sampi Sampi (modern: ϡ; ancient shapes: , ) is an archaic letter of the Greek alphabet. It was used as an addition to the classical 24-letter alphabet in some eastern Ionic dialects of ancient Greek in the 6th and 5th centuries BC, to denote some type of a sibilant sound, probably or , and was abandoned when the sound disappeared from Greek. It later remained in use as a numeral symbol for 900 in the alphabetic (""Milesian"") system of Greek numerals. Its modern shape, which resembles a π inclining to the right with a longish curved cross-stroke, developed during its"
"to the Greek lowercase epsilon (U+03B5, ε) in code page 437. Alternatively, the rarely used logical conjunction sign (U+2227, ∧) at code point 222 (0xDE) could be replaced by the euro sign. Regarding the translation to Unicode it should be noted that some codes do not have a unique, single Unicode equivalent; the correct choice may depend upon context: Atari ST character set The Atari ST character set is the character set of the Atari ST personal computer family including the Atari STE, TT and Falcon. It is based on code page 437, the original character set of the IBM"
"Until 1995, the SI classified the radian and the steradian as ""supplementary units"", but this designation was abandoned and the units were grouped as derived units. SI derived unit SI derived units are units of measurement derived from the seven base units specified by the International System of Units (SI). They are either dimensionless or can be expressed as a product of one or more of the base units, possibly scaled by an appropriate power of exponentiation. The SI has special names for 22 of these derived units (for example, hertz, the SI unit of measurement of frequency), but the"