# Farad

**microfaradFpFpicofaradfaradsnFμFFemtofaradAttofaradExafarad**

The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.wikipedia

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### Michael Faraday

**FaradayFaraday, MichaelM. Faraday**

It is named after the English physicist Michael Faraday. The term "farad" was originally coined by Latimer Clark and Charles Bright in 1861, in honor of Michael Faraday, for a unit of quantity of charge, but by 1873, the farad had become a unit of capacitance.

The SI unit of capacitance is named in his honour: the farad.

### Coulomb

**CPicoCoulomBExacoulomb**

One farad is defined as the capacitance across which, when charged with one coulomb, there is a potential difference of one volt.

Thus, it is also the amount of excess charge on a capacitor of one farad charged to a potential difference of one volt:

### Capacitor

**capacitorscapacitivecondenser**

For example, if the potential difference across a capacitor is halved, the quantity of charge stored by that capacitor will also be halved. A capacitor generally consists of two conducting surfaces, frequently referred to as plates, separated by an insulating layer usually referred to as a dielectric.

The earliest unit of capacitance was the jar, equivalent to about 1.11 nanofarads.

### SI derived unit

**derived unitderived unitsJ/kg**

The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.

### Kilogram

**kgmgmilligram**

s⋅A⋅m⋅kg

Three other base units (cd, A, mol) and 17 derived units (N, Pa, J, W, C, V, F, Ω, S, Wb, T, H, kat, Gy, Sv, lm, lx) in the SI system were defined in relation to the kilogram, and thus its stability was important.

### Supercapacitor

**supercapacitorsultracapacitorelectric double-layer capacitor**

The size of commercially available capacitors ranges from around 0.1 pF to (5 kF) supercapacitors.

This design gave a capacitor with a capacitance on the order of one farad, significantly higher than electrolytic capacitors of the same dimensions.

### Elastance

**darafelectrical elastance**

The reciprocal of capacitance is called electrical elastance, the (non-standard, non-SI) unit of which is the daraf.

The SI unit of elastance is the inverse farad (F −1 ).

### Capacitance

**capacitiveself-capacitanceelectrical capacitance**

One farad is defined as the capacitance across which, when charged with one coulomb, there is a potential difference of one volt. The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.

The SI unit of capacitance is the farad (symbol: F), named after the English physicist Michael Faraday.

### Leyden jar

**Leyden jarsLeiden jarelectric cell**

The original capacitor was the Leyden jar developed in the 18th century.

A typical Leyden jar of one pint size has a capacitance of about 1 nF.

### Centimetre–gram–second system of units

**CGScgs unitsCGS unit**

The abfarad (abbreviated abF) is an obsolete [[centimetre–gram–second system of units#Electromagnetic units in various CGS systems|CGS unit of capacitance]] equal to farads (1 gigafarad, GF).

As well as the volt and amp, the farad (capacitance), ohm (resistance), coulomb (electric charge), and henry are consequently also used in the practical system and are the same as the SI units.

### Metric prefix

**SI prefixunit prefixprefix**

Most electrical and electronic applications are covered by the following SI prefixes:

Double prefixes have been used in the past, such as micromillimetres or "millimicrons" (now nanometres), micromicrofarads (now picofarads), kilomegatons (now gigatons), hectokilometres (now 100 kilometres) and the derived adjective hectokilometric (typically used for qualifying the fuel consumption measures).

### Electric charge

**chargeelectrical chargecharged**

One farad is defined as the capacitance across which, when charged with one coulomb, there is a potential difference of one volt.

### Volt

**VkVvolts**

One farad is defined as the capacitance across which, when charged with one coulomb, there is a potential difference of one volt. Modern capacitors are constructed using a range of manufacturing techniques and materials to provide the extraordinarily wide range of capacitance values used in electronics applications from femtofarads to farads, with maximum-voltage ratings ranging from a few volts to several kilovolts.

### Hertz

**MHzkHzHz**

where F = farad, A = ampere, V = volt, C = coulomb, J = joule, m = metre, N = newton, s = second, W = watt, kg = kilogram, Ω = ohm, Hz = hertz, H = henry.

### Josiah Latimer Clark

**Latimer Clark**

The term "farad" was originally coined by Latimer Clark and Charles Bright in 1861, in honor of Michael Faraday, for a unit of quantity of charge, but by 1873, the farad had become a unit of capacitance.

### Charles Tilston Bright

**Charles BrightBright, Charles TilstonBright**

The term "farad" was originally coined by Latimer Clark and Charles Bright in 1861, in honor of Michael Faraday, for a unit of quantity of charge, but by 1873, the farad had become a unit of capacitance.

### Dielectric

**dielectricsdielectric relaxationpolarization**

A capacitor generally consists of two conducting surfaces, frequently referred to as plates, separated by an insulating layer usually referred to as a dielectric.

### Electronics

**electronicelectronic equipmentelectronic device**

Modern capacitors are constructed using a range of manufacturing techniques and materials to provide the extraordinarily wide range of capacitance values used in electronics applications from femtofarads to farads, with maximum-voltage ratings ranging from a few volts to several kilovolts.

### Parasitic capacitance

**parasiticcapacitanceinline capacitor**

Parasitic capacitance in high-performance integrated circuits can be measured in femtofarads (1 fF = 0.001 pF = F), while high-performance test equipment can detect changes in capacitance on the order of tens of attofarads (1 aF = F). A value of 0.1 pF is about the smallest available in capacitors for general use in electronic design, since smaller ones would be dominated by the parasitic capacitances of other components, wiring or printed circuit boards.

### Integrated circuit

**integrated circuitsmicrochipchip**

Parasitic capacitance in high-performance integrated circuits can be measured in femtofarads (1 fF = 0.001 pF = F), while high-performance test equipment can detect changes in capacitance on the order of tens of attofarads (1 aF = F).

### Printed circuit board

**circuit boardPCBprinted circuit boards**

A value of 0.1 pF is about the smallest available in capacitors for general use in electronic design, since smaller ones would be dominated by the parasitic capacitances of other components, wiring or printed circuit boards.