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Weber (unit)

In physics, the weber (symbol: Wb; IPA: /ˈveɪbɚ, ˈwiːbɚ/) is the SI unit of magnetic flux. It is named after the German physicist Wilhelm Eduard Weber (1804 - 1891) and was established by the IEC in 1930 [1].

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Definition

SI multiples for weber (Wb)
Submultiples			Multiples
Value	Symbol	Name	Value	Symbol	Name
10^–1 Wb	dWb	deciweber	10¹ Wb	daWb	decaweber
10^–2 Wb	cWb	centiweber	10² Wb	hWb	hectoweber
10^–3 Wb	mWb	milliweber	10³ Wb	kWb	kiloweber
10^–6 Wb	µWb	microweber	10⁶ Wb	MWb	megaweber
10^–9 Wb	nWb	nanoweber	10⁹ Wb	GWb	gigaweber
10^–12 Wb	pWb	picoweber	10¹² Wb	TWb	teraweber
10^–15 Wb	fWb	femtoweber	10¹⁵ Wb	PWb	petaweber
10^–18 Wb	aWb	attoweber	10¹⁸ Wb	EWb	exaweber
10^–21 Wb	zWb	zeptoweber	10²¹ Wb	ZWb	zettaweber
10^–24 Wb	yWb	yoctoweber	10²⁴ Wb	YWb	yottaweber
Common multiples are in bold face.

The weber may be defined in terms of Faraday's law, which relates a changing magnetic flux through a loop to the electric field around the loop. A change in flux of one weber per second will induce an electromotive force of one volt.

In SI base units, the dimensions of the weber are $\dfrac{\mbox{kg} \cdot \mbox{m}^2}{\mbox{s}^2 \cdot \mbox{A}}$ . In derived units, they are volt-seconds $(\mbox{V} \cdot \mbox{s})$ .

The weber is a large unit, equal to 1 T m² = 10⁸ maxwells.

This SI unit is named after Wilhelm Eduard Weber. As with all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (Wb). But when an SI unit is spelled out, it should always be written in lowercase (weber), unless it begins a sentence or is the name "degree Celsius".

— Based on The International System of Units, section 5.2.

Category: SI derived units