Weber (unit)
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:
- Wb=kg⋅ ⋅ m2s2⋅ ⋅ A=Ω Ω ⋅ ⋅ C=V⋅ ⋅ s=H⋅ ⋅ A=T⋅ ⋅ m2=JA=N⋅ ⋅ mA=108Mx{cHFFFF}{cHFFFF}{cHFFFFFF} {cHFFFFFF}{cHFFFF} {cH}{cHFFFFFF}{cHFFFFFF}{cHFFFFFF}{cH} {cHFFFF}{cHFF} {cHFF}{cHFFFFFFFFFF}{cH}{cH}{cH}{cHFF}{cHFFFFFFFFFFFFFFFFFF}{cH}{cH}{cHFFFFFFFFFFFFFF}{cH}{cH}{cH}{cH}{cHFFFFFFFFFFFFFFFFFF}{cH}{cHFFFFFFFFFF}{cH}{cH}{cH} {cH}{cH}{cH}{cH}{cH}{cH}{cHFF
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:
| Submultiplos | Multiple | |||||
|---|---|---|---|---|---|---|
| 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 | 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. "