Weber (unit)

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The weber (symbol: Wb) is the unit of magnetic flux or magnetic induction flux in the International System of Units equivalent to the magnetic flux that, when passing through a circuit of a single turn, produces in it an electromotive force of 1 volt if said flux is canceled in 1 second by uniform decrease. It is symbolically represented by Wb. The name of this unit was given in honor of the German physicist Wilhelm Eduard Weber.

1 Wb = 1 V s = 1 T m² = 1 m²kg s ^-2 A^-1.

Its equivalent in the Cegesimal System of Units (CGS) is the maxwell. 1 maxwell = 10^-8 Wb.

The weber is also expressed in various other units:

{displaystyle mathrm {Wb} ={dfrac {mathrm {kg} {cdot }mathrm {m} ^{2}}{mathrm {s} ^{2}{cdot }mathrm {A} }}=Omega {cdot }{text{C}}=mathrm {V} {cdot }mathrm {s} =mathrm {H} {cdot }mathrm {A} =mathrm {T} {cdot }mathrm {m} ^{2}={dfrac {mathrm {J} }{mathrm {A} }}={dfrac {mathrm {N} {cdot }mathrm {m} }{mathrm {A} }}=10^{8}mathrm {Mx} }

where Wb = weber,
Ω = ohm,
C = coulomb,
V = volt,
T = tesla,
J = joule,
N = newton
m = meter,
s = second,
A = ampere,
H = Henry,
Mx = maxwell.

Multiples of the SI

The following is a table of the multiples and submultiples of the International System of Units:

International Weber System Multiples (Wb)
Value	Symbol	Name	Value	Symbol	Name
Submultiplos			Multiple
10⁻¹ Wb	dWb	deciweber	10¹ Wb	daWb	decaweber
10⁻² Wb	cWb	centiweber	10² Wb	hWb	hectoweber
10⁻³ Wb	mWb	miliweber	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
10⁻²⁷ Wb	rWb	rontoweber	10²⁷ Wb	RWb	ronnaweber
10⁻³⁰ Wb	qWb	quectoweber	10³⁰ Wb	QWb	quettaweber
Common units are in bold.

This unity of the International System is named in honor of Wilhelm Eduard Weber. In the units of the SI whose name comes from a person's own name, the first letter of the symbol is written with capital (Wb), while his name always starts with a tiny letter (weber), except in case you start a sentence or a title.
Based on The International System of UnitsSection 5.2.

History

In 1861, the British Association for the Advancement of Science (known as 'The BA') established a committee headed by William Thomson (later Lord Kelvin) to study electrical units. In a February 1902 manuscript, with handwritten notes by Oliver Heaviside, Giovanni Giorgi proposed a set of rational units of electromagnetism, including the weber, noting that "the product of the volt in the second has been called the weber by BA" 3. 4;.

The International Electrotechnical Commission began work on terminology in 1909 and established Technical Committee 1 in 1911, its oldest established committee, "to sanction the terms and definitions used in the different electrotechnical fields and to determine the equivalence of terms used in different languages."

It was not until 1927 that TC1 took up the study of several outstanding problems related to electrical and magnetic quantities and units. Discussions of a theoretical nature ensued in which eminent electrical engineers and physicists considered whether magnetic field strength and magnetic flux density were in fact quantities of the same nature. As the disagreement continued, the CIS decided to make an effort to remedy the situation. He instructed a working group to study the issue in preparation for the next meeting.

In 1930, TC1 decided that the magnetic field intensity (H) is of a different nature than the magnetic flux density (B), [9] and the question of naming the units for these fields and related quantities was raised, among them the integral of magnetic flux density.

In 1935, TC 1 recommended names for various electrical units, including the weber for the practical unit of magnetic flux (and the maxwell for the CGS unit).

It was decided to expand the existing series of practical units into a complete and comprehensive system of physical units, adopting the recommendation in 1935 "that the system with the four fundamental units proposed by Professor Giorgi be adopted subject to the final selection of the fourth fundamental unit". This system received the designation "Giorgi system".

Also in 1935, TC1 passed responsibility for "electric and magnetic quantities and units" to the new TC24. This "led eventually to the universal adoption of the Giorgi system, which unified electromagnetic units with the MKS dimensional system of units, the set now known simply as the SI (Système International d'unités) system".

In 1938, TC24 "recommended as connecting link [from mechanical to electrical units] the permeability of free space with the value of μ 0 = 4π × 10 - 7 H / m. This group also recognized that any of the practical units already in use (ohms, amperes, volts, henry, farads, coulombs, and weber), could equally serve as the fourth fundamental unit. "After consultation, the ampere it was adopted as the fourth unit of the Giorgi system in Paris in 1950. "

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