Faraday constant

(noun)

The magnitude of electric charge per mole of electrons.

Related Terms

Examples of Faraday constant in the following topics:

  • Avogador's Number

    • The actual number of atoms or molecules in one mole is called Avogadro's constant (NA), in recognition of Italian scientist Amedeo Avogadro .
    • The value of Avogadro's constant, NA , has been found to equal 6.02×1023 mol−1.
    • Avogadro's constant is a scaling factor between macroscopic and microscopic (atomic scale) observations of nature.
    • As such, it provides the relation between other physical constants and properties.
    • For example, it establishes a relationship between the gas constant R and the Boltzmann constant k,

  • Electrostatic Shielding

    • Electrostatic shielding is the phenomenon that occurs when a Faraday cage blocks the effects of an electric field.
    • A Faraday cage is a closed chamber consisting of a conducting material or a mesh of such a material.
    • The action of a Faraday cage may depend on whether or not it is grounded.
    • Electrical linemen often wear suits made of Faraday cages so as to avoid electrocution.
    • Elevators can act as unintended Faraday cages, shielding cell phones and radios from signal from the outside.

  • Induced EMF and Magnetic Flux

    • The apparatus used by Faraday to demonstrate that magnetic fields can create currents is illustrated in the following figure.
    • For a varying magnetic field, we first consider the magnetic flux $d\Phi _B$ through an infinitesimal area element dA, where we may consider the field to be constant:

  • Maxwell's Predictions and Hertz' Confirmation

    • Combining the work of physicists including Oersted, Coulomb, Gauss, and Faraday, and adding his own insights, James Clerk Maxwell developed a complete and overarching theory showing electric and magnetic forces are not separate, but different forms of the same thing: the electromagnetic force.
    • The strength of the force is related to the electric constant ε0, also known as the permitivity of free space.

  • Faraday's Law of Induction and Lenz' Law

    • The direction (given by the minus sign) of the EMF is so important that it is called Lenz' law after the Russian Heinrich Lenz (1804–1865), who, like Faraday and Henry, independently investigated aspects of induction.
    • Faraday was aware of the direction, but Lenz stated it, so he is credited for its discovery .

  • Van de Graff Generators

    • The sphere acts as a Faraday shield, shielding the upper roller and comb from the electric field produced by charges on the outside of the sphere.

  • Conductors and Fields in Static Equilibrium

    • This occurrence is similar to that observed in a Faraday cage, which is an enclosure made of a conducting material that shields the inside from an external electric charge or field or shields the outside from an internal electric charge or field.

  • Constant Velocity

    • An object moving with constant velocity must have a constant speed in a constant direction.
    • Motion with constant velocity is one of the simplest forms of motion.
    • To have a constant velocity, an object must have a constant speed in a constant direction.
    • Constant direction constrains the object to motion to a straight path.
    • Examine the terms for constant velocity and how they apply to acceleration

  • Constant Pressure and Volume

    • Isobaric process is one in which a gas does work at constant pressure, while an isochoric process is one in which volume is kept constant.
    • A process in which a gas does work on its environment at constant pressure is called an isobaric process, while one in which volume is kept constant is called an isochoric process.
    • An isobaric process occurs at constant pressure.
    • Since the pressure is constant, the force exerted is constant and the work done is given as PΔV.
    • Since pressure is constant, the work done is PΔV.

  • Motion with Constant Acceleration

    • Constant acceleration occurs when an object's velocity changes by an equal amount in every equal time period.
    • An object experiencing constant acceleration has a velocity that increases or decreases by an equal amount for any constant period of time.
    • Assuming acceleration to be constant does not seriously limit the situations we can study and does not degrade the accuracy of our treatment, because in a great number of situations, acceleration is constant.
    • When it is not, we can either consider it in separate parts of constant acceleration or use an average acceleration over a period of time.
    • When you drop an object, it falls vertically toward the center of the earth due to the constant acceleration of gravity.