Electromagnetic quantities

flow of electric charge

spatial distribution of vectors allowing the calculation of the magnetic force on a test particle

physical property that quantifies an object's interaction with electric fields

Voltage, also known as (electrical) potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. In a static electric field, it corresponds to the work needed per unit of charge to move a positive test charge from the first point to the second point. In the International System of Units (SI), the derived unit for voltage is the volt (V).

spatial distribution of vectors representing the force applied to a charged test particle

Capacitance is the ability of an object to store electric charge. It is measured by the change in charge in response to a difference in electric potential, expressed as the ratio of those quantities. Commonly recognized are two closely related notions of capacitance: self capacitance and mutual capacitance. An object that can be electrically charged exhibits self capacitance, for which the electric potential is measured between the object and ground. Mutual capacitance is measured between two components, and is particularly important in the operation of the capacitor, an elementary linear elec

line integral of the electric field

Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it. The electric current produces a magnetic field around the conductor. The magnetic field strength depends on the magnitude of the electric current, and therefore follows any changes in the magnitude of the current. From Faraday's law of induction, any change in magnetic field through a circuit induces an electromotive force (EMF) (voltage) in the conductors, a process known as electromagnetic induction. This induced voltage created by the changing current has the effect of opposi

surface integral of the magnetic flux density

luminous flux per solid angle in a given direction

product of the electric current through a loop, the area enclosed by the loop and the unit vector perpendicular to the loop

surface integral of the electric flux density; measured in coulombs

electric current per area of cross section

measure of how much a material will become magnetized in an applied magnetic field

vector physical quantity measuring the separation of positive and negative electrical charges within a system

vector physical quantity describing production of a potential difference across a conductor when it is exposed to a varying magnetic field

electric charge per volume, length or area

a quantity representing the sum of magnetizing forces along a circuit

potential energy that results from conservative Coulomb forces

application of an external magnetic field to a ferromagnet

energy carried by a magnetic field

intrinsic magnetic dipole moment of neutrons

Electrical elastance is the reciprocal of capacitance. The SI unit of elastance is the inverse farad (F−1). The concept is not widely used by electrical and electronic engineers, as the value of capacitors is typically specified in units of capacitance rather than inverse capacitance. However, elastance is used in theoretical work in network analysis and has some niche applications, particularly at microwave frequencies.