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The Faraday constant, denoted by the symbol F and sometimes stylized as ℱ, is named after Michael Faraday. In chemistry and physics, this constant represents the magnitude of electric charge per mole of electrons.[1] It has the currently accepted value

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F = 96485.33212.. C·mol−1.[2]

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Since 1 mol electrons = 6.02214076×1023 electrons (Avogadro's number),[3] the Faraday constant is equal to the elementary chargee, the magnitude of the charge of an electron, multiplied by 1 mole:[4] Rd client windows 10.

F = 96485.3..C/(1mol) = 96485.3..C/(6.022..×1023) = 1.60217663410×10−19 C = e

One common use of the Faraday constant is in electrolysis calculations. One can divide the amount of charge in coulombs by the Faraday constant in order to find the chemical amount (in moles) of the element that has been oxidized.

The value of F was first determined by weighing the amount of silver deposited in an electrochemical reaction in which a measured current was passed for a measured time, and using Faraday's law of electrolysis.[5]

2019 redefinition[edit]

Since the 2019 redefinition of SI base units, which introduced exactly defined values for the elementary charge and the mole, the Faraday constant is exactly

e × (1 mol) mol−1 = 1.602176634×10−19 C × 6.02214076×1023 mol−1 = 96485.3321233 C·mol−1.
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Other common units[edit]

  • 96.485 kJ per volt–gram-equivalent
  • 23.061 kcal per volt–gram-equivalent
  • 26.801 A·h/mol

Faraday unit of charge[edit]

Related to Faraday's constant is the 'faraday', a unit of electrical charge. It is much less common than the coulomb, but sometimes used in electrochemistry.[6] One faraday of charge is the magnitude of the charge of one mole of electrons, i.e. 96485.33212..C.[2]

Expressed in faradays, the Faraday constant F equals '1 faraday of charge per mole'.

This faraday unit is not to be confused with the farad, an unrelated unit of capacitance (1 farad = 1 coulomb / 1 volt).

Popular media[edit]

The Simpsons episode 'Dark Knight Court' has Mr. Burns asking Comic Book Guy how much he wants for his entire comic book inventory. He says 'the speed of light expressed as dollars' and Mr. Burns tells Smithers to 'just give him Faraday's Constant'. The check is written for $96,485.34.

See also[edit]

References[edit]

  1. ^The term 'magnitude' is used in the sense of 'absolute value': The charge of an electron is negative, but F is always defined to be positive.
  2. ^ ab'2018 CODATA Value: Faraday constant'. The NIST Reference on Constants, Units, and Uncertainty. NIST. 20 May 2019. Retrieved 2019-05-20.CS1 maint: discouraged parameter (link)
  3. ^Brown, L.; Holme, T. (2011) Chemistry for Engineering Students, Brooks/Cole.
  4. ^Schmidt-Rohr, K. (2020). 'Analysis of Two Definitions of the Mole That Are in Simultaneous Use, and Their Surprising Consequences” J. Chem. Educ.97: 597-602. http://dx.doi.org/10.1021/acs.jchemed.9b00467
  5. ^NIST Introduction to physical constants
  6. ^Foundations Of Physics, Volume 2, by R. S. Gambhir, 1993, p. 51
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Faraday_constant&oldid=1018845538'
C4/C5
Overview
ManufacturerFord Motor Company
Production1964–1986
Body and chassis
Class3-speed longitudinalautomatic transmission
RelatedFord C6
Chronology
PredecessorFord-O-Matic
SuccessorAOD

The Ford C4 is a three-speed, medium-duty automatic transmission introduced on 1964 model year vehicles and produced through 1981. The C4 was designed to be a lighter and more simple replacement for the original Ford-O-Matic two speed transmission being used in smaller, less powerful cars.

Ford used the term 'SelectShift' because in the first C4's, placing the gear selector in D2 forced the transmission to start in second gear and then shift to third gear. If the transmission was placed in D1, the transmission would start in first gear, then shift to second and third gear as normal. If the gear selector was placed into L, the transmission stayed in first gear only. The shifter display appeared as P-R-N-D2-D1-L. Because this was confusing, later versions of the C4 were changed to a P-R-N-D-2-1 (or L) pattern typically seen today.

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Because of its cast iron construction, the Ford-O-Matic was very heavy. In designing the C4, Ford used an aluminum alloy, three-piece case (bell housing, main case, and tailhousing). The aluminum case and the use of a more simple Simpson planetary gearset reduced the weight significantly. It was primarily used with Ford's inline six-cylinder engines and small V8 engines (see Ford Windsor engines), usually up to 302 in³ (5.0 L). By comparison, the 351 Windsor and 351 Cleveland small and intermediate-block engines were backed by the medium-duty FMX or the heavy-duty C6 that debuted in 1966. Some C4s were built with a larger spread bell housing to use with 351M V8s, but these are rare. A few were also used with FE engines, mostly the 390. in full-size cars. Ratios are 2.46 low, 1.46 second and direct high. Age of empires 2013 free download.

The early model C4 (1964–1969) used a .788-inch 24-spline input shaft, which was upgraded in 1970 to 26-spline and .839-inch. The upgrade also included a matching clutch hub of 26-spline. In 1971, Ford went to a 26/24-spline input shaft, meaning the torque-converter side is 26-spline and the clutch hub is 24-spline.

The C4 was also found with valve bodies requiring a different number of bolts, 8-bolt vs 9-bolt. A 9-bolt valvebody can be used on either case, but a nut & bolt must be used on the valve body in the empty hole, dropping the bolt in from the top and using the nut on the bottom/filter side.

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Modified C4s remain popular with hot rodders and drag racers due to their simplicity and durability.

Year & Model breakdown:

SymbolC# Regular Expression Cheat Sheet
  • 1964–1966 Select Shift, 24/24 spline, castings: C4, C5, C6
  • 1967–1969 Select Shift, 24/24 spline, castings: C7, C8, C9
  • 1970–1970 Select Shift, 26/26 spline, castings: D0
  • 1971–1979 Select Shift, 26/24 spline, castings: D1, D2, D3, D4, D5, D6, D7, D8, D9

Applications:

  • 1973–1977 Ford Bronco
  • 1974–1982 Ford Cortina
  • 1964-1967 Ford Econoline and Falcon Vans
  • 1965–1983 Ford F-Series
  • 1964–1970 Ford Fairlane
  • 1978–1983 Ford Fairmont
  • 1965–1970 Ford Falcon
  • 1975–1982 Ford Granada
  • 1975–1980 Ford LTD
  • 1970–1977 Ford Maverick
  • 1965–1981 Ford Mustang
  • 1965–1979 Ford Ranchero
  • 1968–1981 Ford Thunderbird
  • 1968–1976 Ford Torino
  • 1964–1981 Lincolns
  • 1977–1980 Lincoln Versailles
  • 1974–1980 Mercury Bobcat
  • 1972–1981 Mercury Capri
  • 1964–1977 Mercury Comet
  • 1967–1981 Mercury Cougar
  • 1975–1980 Mercury Monarch
  • 1968–1976 Mercury Montego
  • 1978–1981 Mercury Zephyr

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C5[edit]

As fuel economy became more important in the 1970s, and 1980s, the C4 was replaced in 1982 by the C5, which was essentially a C4 with a lock-up clutch in the torque converter to improve highway fuel economy. It bore the casting numbers E2, E3, E4, E5, and E6, corresponding with the year it was produced. The C5 was phased out in 1986, replaced by the AOD. The production plant in Sharonville, Ohio was converted to production of the C6 transmission which was relocated from Livonia, Michigan, as the Livonia facility was converted to the AOD.

Applications:

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  • 1986 Ford Aerostar
  • 1983–1986 Ford Ranger
  • 1983–1985 Ford Bronco II
  • 1983–1986 Ford LTD
  • 1982–1986 Ford Thunderbird
  • 1982–1986 Mercury Capri
  • 1982–1986 Mercury Cougar
  • 1983–1986 Mercury Marquis
  • 1983 Mercury Zephyr

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