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In electromagnetism and electronics, capacitance is the ability of a body to hold an electrical charge.

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Wikipedia About Capacitance

In electromagnetism and electronics, capacitance is the ability of a body to hold an electrical charge.

Capacitance is also a measure of the amount of electric charge stored (or separated) for a given electric potential. A common form of charge storage device is a two-plate capacitor. If the charges on the plates are +Q and −Q, and V gives the voltage between the plates, then the capacitance is given by

C = \frac{Q}{V}.

The SI unit of capacitance is the farad; 1 farad = 1 coulomb per volt.

The energy (measured in joules) stored in a capacitor is equal to the work done to charge it. Consider a capacitance C, holding a charge +q on one plate and -q on the other. Moving a small element of charge \mathrm{d}q from one plate to the other against the potential difference V = q/C requires the work \mathrm{d}W:

\mathrm{d}W = \frac{q}{C}\,\mathrm{d}q

where W is the work measured in joules, q is the charge measured in coulombs and C is the capacitance, measured in farads.

We can find the energy stored in a capacitance by integrating this equation. Starting with an uncharged capacitance (q=0) and moving charge from one plate to the other until the plates have charge +Q and -Q requires the work W:

W_\text{charging} = \int_{0}^{Q} \frac{q}{C} \, \mathrm{d}q = \frac{1}{2}\frac{Q^2}{C} = \frac{1}{2}CV^2 = W_\text{stored}.

Capacitance and 'displacement current'

The physicist James Clerk Maxwell invented the concept of displacement current in his 1861 paper in connection with the displacement of electrical particles:See On Physical Lines of Force: Part III–The Theory of Molecular Vortices applied to Statical Electricity Cquote: Bodies which do not permit a current of electricity to flow through them are called insulators. But though electricity does not flow through them, electrical effects are propagated through them … a dielectric is like an elastic membrane which may be impervious to the fluid, but transmits the pressure of the fluid on one side to that on the other. Cquote: Electromotive force acting on a dielectric produces a state of polarization of its parts...capable of being described as a state in which every particle has its poles in opposite conditions. Cquote: ...we may conceive that the electricity in each molecule is so displaced that one side is rendered positively, and the other negatively electrical, but that the electricity remains entirety connected with the molecule, and does not pass from one molecule to another. Cquote: This displacement does not amount to a current, because when it attains a certain value it remains constant, but it is the commencement of a current, and its variations constitute currents in the positive or negative direction, according as the displacement is increasing or diminishing. Cquote: ...when the electromotive force varies, the electric displacement also varies. But a variation of displacement is equivalent to a current, and this current must be taken into account...

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News about Capacitance

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PRODUCT HOW-TO: Taking the guesswork out of mobile/portable TV design

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Kemet Awarded Certificates of Registration to the Aerospace Quality Standard AS9100

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KEMET Enters into Agreement for New Credit Facility

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Belden Among Industry's First Cable Producers to Achieve Fieldbus Foundation H 1 Cable ...

ThomasNetRICHMOND, IN - Belden, a world leader in the development of signal transmission products for the industrial, building management, enterprise, broadcast, and security markets, has announced that one of the company's family of IndustrialTuff DataBus Cables for FOUNDATION fieldbus applications is among the industry's first to achieve registration to the FOUNDATION fieldbus H1 Cable Test ...http://news.thomasnet.com/companystory/550384

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Apache Design Solutions Introduces Totem, the Industry’s First Power ...

Businesswire.comTotem incorporates transistor-level power model with voltage de-rated switching current technique, and SPICE-accurate decoupling capacitance extraction. In addition, impact of package and board effects is included through the ... http://www.businesswire.com/news/home/20090421005365/en

Agilent Technologies Enhances Performance of Popular Atomic Force ...

WebWireSMM Mode outperforms traditional AFM-based scanning capacitance microscopy techniques, offering greater application versatility, the ability to acquire quantitative results, and the highest sensitivity and dynamic range in the industry. Agilent’s ... http://www.webwire.com/ViewPressRel.asp?aId=92622

AVX announces zinc oxide varistors

Electronics TalkLow- and high-capacitance versions are offered, ranging from 40 to 3,000 pF. The varistor series is ideal for transient protection applications where power consumption is a primary concern. These include high clock speed ICs, battery-operated devices ... http://www.electronicstalk.com/news/avx/avx188.html

Analysis -- ISSCC 2009 Special, Part 2: Trends in Papers

日経BPネットIn short-range wireless communication, papers ranged from fundamental capacitance-coupled and magnetic field-coupled communication technologies to applications, including presentations on inter-chip and intrabody communication. NEC Corp of Japan and ... http://techon.nikkeibp.co.jp/article/HONSHI/20090327/167866/

Rick's Wireless Networking

Chip Design MagazineThe zylinks-ristor, or memacitor, increases its capacitance when current is run through it. Capacitance reduces when current is run the other direction. The memductor is similar, increasing its inductance as current flows through the device. "It is ... http://www.chipdesignmag.com/display.php?articleId=3186

Search results for Capacitance

Capacitance and Uses of Capacitors

The Electronics Club ... Capacitance Capacitance (symbol C) is a measure of a capacitor's ability to store charge.http://www.kpsec.freeuk.com/capacit.htm

Capacitance - Wikiversity

Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. In a capacitor, there are two conducting electrodes which are ... http://en.wikiversity.org/wiki/Capacitance

capacitance - Definition of capacitance at YourDictionary.com

Elec. that property of a capacitor which determines how much charge can be stored in it for a given potential difference between its terminals, equal to the ratio of the charge ... http://www.yourdictionary.com/capacitance

capacitance - definition of capacitance by the Free Online Dictionary ...

ca·pac·i·tance (k-p s-t ns) n. 1. Symbol C The ratio of charge to potential on an electrically charged, isolated conductor. 2. Symbol C The ratio of the electric charge ... http://www.thefreedictionary.com/capacitance

capacitance definition | Dictionary.com

Copy & paste this link to your blog or website to reference this pagehttp://dictionary.reference.com/browse/capacitance

Wikipedia results for Capacitance

Capacitance - Wikipedia, the free encyclopedia

In electromagnetism and electronics, capacitance is the ability of a body to hold an electrical charge. Capacitance is also a measure of the amount of electric charge stored (or ... http://en.wikipedia.org/wiki/Capacitance

Capacitor - Wikipedia, the free encyclopedia

Solving this for C = Q / V reveals that capacitance increases with area and decreases with separation. The capacitance is therefore greatest in devices made from materials with a high ... http://en.wikipedia.org/wiki/Capacitor

Touch switch - Wikipedia, the free encyclopedia

Capacitance touch switch; A capacitance switch needs only one electrode to function. The electrode can be placed behind a non-conductive panel made of for example wood, glass or ... http://en.wikipedia.org/wiki/Touch_switch

Capacitance meter - Wikipedia, the free encyclopedia

A capacitance meter is a piece of electronic test equipment used to measure capacitors. Depending on the sophistication of the meter, it may simply display the capacitance or it ... http://en.wikipedia.org/wiki/Capacitance_meter

Quantum capacitance - Wikipedia, the free encyclopedia

Quantum capacitance (density) is a physical value first introduced by Serge Luryi (1988) [1] to describe the 2D-electronic systems in silicon surfaces and AsGa junctions.http://en.wikipedia.org/wiki/Quantum_capacitance
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Answers for Capacitance

metaphysics1221Capacitance?metaphysics1221Capacitance is the ability of an electrical component to store charge. some of its uses is to smoothen curent : when AC(Alternatinc Current) is converted into DC(Direct Current) it flows in bits on...Hoosier DaddySteps when solving for capacitance, charge and voltage in a capacitor schematic?Hoosier DaddySince you are given total Voltage (V) and total Capacitance (C) of the circuit you can calculate the total charge(Q). The formula Q = CV can be used in either of it`s three arrangements. It can be...hellooosWhat does Capacitance depend on in a parallel plate capacitor?hellooosAll three are correct, and are the only ones. See different materials dielectric constant: http://hyperphysics.phy-astr.gsu.edu/Hbase/tables/diel.htmlcuriously.curiousCan you give me a conceptual understanding of inductance and capacitance?curiously.curiousCapacitors and Inductors are components which store energy. For this reason they are also known as storage elements. A capacitor stores energy in electric field while an inductor stores energy in magn...spike_reznor90What is the capacitance of the capacitor?spike_reznor90Capacitance, C, is the ratio of the total charge stored in a capacitor with the potential difference across the plates of the capacitor. Now, capacitance does not change with potential difference, thu...
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