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Flux is the flow that occurs as a result of a potential difference. It can be described as a through variable , where potential difference is the across variable. The product of the flux and the potential difference is the power, which is the rate of change of the conserved quantity, e.g energy.
There are many types of flux:
Flux is a quantity proportional to the surface integralMultivariate calculus In mathematics, using a surface integral is a calculus technique found in differential geometry; from the start it has found major applications in physics, especially in the classical theory of electromagnetism. Surface integrals are of the normal (perpendicular) force fieldIn physics, a field is an assignment of a quantity to every point in space. Physicists distinguish between three types of fields, in increasing generality: scalar fields, such as temperature, vector fields, such as the magnitude and direction of the force intensity over a given surface.
Where FN is the normal component of a fieldIn physics, a field is an assignment of a quantity to every point in space. Physicists distinguish between three types of fields, in increasing generality: scalar fields, such as temperature, vector fields, such as the magnitude and direction of the force (eg, gravitational field, magnetic fieldIn physics, a magnetic field is an entity produced by moving electric charges ( electric currents) that exerts a force on other moving charges. The quantum-mechanical spin of a particle produces magnetic fields and is acted on by them as though it were a, electric fieldIn physics, an electric field is an effect produced by an electric charge that exerts a force on charged objects in its vicinity. Definition and derivation The mathematical definition of the electric field is developed as follows. Coulomb's law gives the) and K is the constant of proportionality between the field and the flux density ( permittivityIn electromagnetism, permittivity ε is a measure of how much a medium changes to absorb energy when subject to an electric field. It is defined as the ratio D / E where D is the electric displacement by the medium and E is the electric field stren, permeabilityPermeability has several meanings: # In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field. In geology, permeability is a measure of the ability of a material to transmit fluids through it., etc.).
For electromagnetic radiation, flux signifies the energy per unit time (or power) passing through a surface. (See also flux unit).
The term is also used to denote the volume or mass of fluid or particles transferred across a given area perpendicular to the direction of flow in a given time. For photons or particles, flux is the number passing through a surface per unit time. In nuclear physics, flux commonly means the product n×v, where n is the number of particles per unit volume and v is their mean velocity.
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