capacitance?

Question

related to physics and also with current

Answer 1

capacitance

in electricity, capability of a body, system, circuit, or device for storing electric charge. Capacitance is expressed as the ratio of stored charge in coulombs to the impressed potential difference in volts. The resulting unit of capacitance is the farad [for Michael Faraday]. In an electric circuit the device designed to store charge is called a capacitor. An ideal capacitor, i.e., one having no resistance or inductance, may be spoken of as a capacitance. When an alternating current flows through a capacitor, the capacitor produces a reactance that resists the current (see impedance). While every element of a circuit has some capacitance, it is a goal of good design to reduce such unwanted or stray capacitance to a minimum.

Answer 2

Capacitor is two metal plate separated by a medium called dielectric which is really a type of semiconductor. It is used as an energystorage device. The system works by storing electrons at the plates and thangive back during circuit interruption.
The amount of energy stored is a function of distance and is called Capacitance.. The Unit of energy storage capability is called the farad=ratio of coulomb per volt.. Dimensional analysis of the unit indicates the dimension of distance which is the Meter

Answer 3

Between any two conductors, there is what is called capacitance, the ability to hold an electrical charge. Between you and the light, capacitance exists. It's basic unit of measurement is the Farad, but capacitance is usually measures in microfarads.

Answer 4

Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. The capacitance is usually defined as the ratio of the total electric charge placed on the object to its voltage:


or, according to Gauss's law, the capacitance can be expressed as the electric flux per volt
Capacitance exists between any two conductors insulated from one another. The formula defining capacitance above is valid if it is understood that the conductors have equal but opposite charge Q, and the voltage V is the potential difference between the two conductors.

The SI unit of capacitance is the farad (F). A capacitance of one farad results in a potential of one volt for one coulomb of charge. The capacitance of the majority of capacitors used in electronic circuits is several orders of magnitude smaller than the farad. The most common units of capacitance in use today are the microfarad (µF), the nanofarad (nF) and the picofarad (pF).

It is instructive to use the farad to test the claim that all units can be reduced to the SI minima of kilograms, meters, seconds, and coulombs. For our purposes, we start with the equations W = QV and Q = CV, whence the units of capacitance (C) are those of Q squared over W (work). Now, Q squared is measured in coulombs squared (fundamental SI units), while W is measured in newton-meters, with one newton equating to one kilogram-meter per second squared, whence the units of W are kilogram-meters squared per second squared. Dividing through, one finds that the farad is equivalent to one coulomb squared-second squared per kilogram-meter squared in base SI units.

It should be noted that the above equation (C = Q/V) is only applicable for values of Q which are much larger than the electron charge e = 1.602×10-19 C. For example, if a capacitance of 1 pF is charged to a voltage of 100 nV, the equation would predict a charge Q = 10-19 C, which is smaller than the charge on a single electron.

The capacitance can be calculated if the geometry of the conductors and the dielectric properties of the insulator between the conductors are known. Indeed, for ideal dielectrics, capacitance is strictly a function of the geometry of the system. For example, the capacitance of a parallel-plate capacitor constructed of two identical plane electrodes of area A at constant spacing d is approximately equal to the following:


where

C is the capacitance in farads, F
ε0 is the permittivity of free space, measured in farads per meter
εr is the dielectric constant or relative permittivity of the insulator used
A is the area of each plane electrode, measured in square metres
d is the separation between the electrodes, measured in metres
It should be noted that the dielectric constant for a number of very useful dielectrics (ferroelectric materials) changes as a function of the applied electrical field, so the capacitance for these devices is no longer purely a function of device geometry.



where

C is the capacitance in farads, F
Q is the charge in coulombs, C
V is the potential in volts, V
Φ is the electric flux associated with the charge Q in coulombs
Compare this form with the definition of inductance. The above uses SI units; an alternative unit to measure capacitance is the centimetre in the cgs system of measurement[1]. It should be noted that 1 F = 9 × 1011 cm.

Answer 5

1) The ratio of an impressed charge on a conductor to the corresponding change in potential.
2)The ratio of the charge on either conductor of a capacitor to the potential difference between the conductors.
https://www.electrikals.com/

Answer 6

sure is, and it is measured in Farads.

Answer 7

be clear in asking...