Weber (unit)

The Weber (symbol Wb) is the SI unit of magnetic flux. It is named for the German physicist Wilhelm Eduard Weber.

The ninth CGPM (Conférence Générale des Poids et Mesures, General Conference on Weights and Measures) ratified in 1948 a definition based on Faraday's law for magnetic induction. This law connects electromotive force $\scriptstyle {\mathcal {E}}$, (in volt), to the rate of change of magnetic flux Φ (in Wb/s);

${\mathcal {E}}=-{\frac {d\Phi }{dt}}$

The formal definition reads: One weber is the magnetic flux which, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. (Resolution 2, International Committee for Weights and Measures. 1946)

Wb = V⋅s = N⋅m⋅A⁻¹ = kg⋅A⁻¹⋅s⁻²⋅m² = T⋅m², where A stands for ampere, T for tesla, V for volt, and N for newton.

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