Wb
Definition
Noun: 1. Weber: A unit of magnetic flux in the International System of Units (SI). It is defined as the magnetic flux that, linking a circuit of one turn, produces an electromotive force of one volt as it is reduced to zero at a uniform rate in one second. One weber is equal to 100,000,000 (10⁸) maxwells, the corresponding unit in the centimeter-gram-second (CGS) system.
Usage Notes
- Abbreviation: "Wb" is the standard symbol for the weber. It is always written with a capital 'W' and a lowercase 'b'.
- Context: This term is used exclusively in scientific and engineering contexts, particularly in physics and electrical engineering, when discussing electromagnetism, magnetic fields, and induction.
- Plural: The plural form is "webers," and the symbol remains "Wb" (e.g., 5 Wb).
Examples
- The magnetic flux through the coil was measured to be 0.5 Wb.
- According to Faraday's law, a change in magnetic flux of one weber per second will induce an electromotive force of one volt in a single loop of wire.
- The Earth's magnetic field represents a very small flux density, on the order of microwebers (µWb) per square meter.
Advanced Usage
- Derived Units: The weber is used to define other SI units.
- Tesla (T): The unit of magnetic flux density. One tesla is equal to one weber per square meter (1 T = 1 Wb/m²).
- Prefixes: Metric prefixes are commonly used with "weber" to denote very large or very small quantities.
- milliweber (mWb): 10⁻³ webers
- microweber (µWb): 10⁻⁶ webers
- kiloweber (kWb): 10³ webers
Variants and Related Words
- Weber (full word): The full, unabbreviated name of the unit. It is named after the German physicist Wilhelm Eduard Weber.
- Maxwell (Mx): The unit of magnetic flux in the CGS system. 1 Wb = 10⁸ Mx.
- Flux: A general term for the flow of a physical quantity through a given surface. Magnetic flux is the specific quantity measured in webers.
Synonyms
- Unit of magnetic flux: This is a descriptive synonym, but "weber" or "Wb" is the precise technical term.
Related Concepts (Not Synonyms)
- Volt (V): The unit of electromotive force, related to the weber via Faraday's law of induction.
- Henry (H): The unit of electrical inductance. One henry is equal to one weber per ampere (1 H = 1 Wb/A).
Noun
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a unit of magnetic flux equal to 100,000,000 maxwells
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