Weber_(unit) Weber_(unit)

Weber (unit) - Definition and Overview
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In physics, the weber (symbol: Wb) is the SI derived unit of magnetic flux. It is named after the German physicist Wilhelm Eduard Weber (1804 - 1891). The weber is a large unit, equal to <math>10^8<math> maxwells. One usually deals with fractions of a weber.

Magnetic flux is the rate at which a magnetic field (whose flux density is measured in teslas) crosses a surface perpendicular to the flow of the field. If a varying magnetic field passes perpendicularly through a loop of (conducting) material, the field induces a voltage across the loop. If the induced potential is one volt, then the flux is changing at one weber per second.

Conversely, if the current flowing through a loop changes, it will induce a magnetic field. A change of one ampere per second in the coil induces a flux of one weber.

The dimensions for the weber are, in derived units, volt-seconds (V·s). In SI base units, they are kg·m2·s-2·A-1.

SI electromagnetism units

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Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C A·s Electric charge, Quantity of electricity
volt V J/C = kg·m2·s−3·A−1 Potential difference
ohm Ω V/A = kg·m2·s−3·A−2 Resistance, Impedance, Reactance
ohm metre Ω·m kg·m3·s−3·A−2 Resistivity
farad F C/V = kg−1·m−2·A2·s4 Capacitance
farad per metre F/m kg−1·m−3·A2·s4 Permittivity
reciprocal farad F−1 kg1·m2·A−2·s−4 Elastance
siemens S Ω−1 = kg−1·m−2·s3·A2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1·m−3·s3·A2 Conductivity
weber Wb V·s = kg·m2·s−2·A−1 Magnetic flux
tesla T Wb/m2 = kg·s−2·A−1 Magnetic flux density
ampere per metre A/m m−1·A magnetic induction
ampere-turns per weber A/Wb kg−1·m−2·s2·A2 Reluctance
henry H V·s/A = kg·m2·s−2·A−2 Inductance
henry per metre H/m kg·m·s−2·A−2 Permeability
(dimensionless) - - Magnetic susceptibility


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