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The unit 'weber' is the standard unit of measurement for magnetic flux in the International System of Units (SI). Magnetic flux is defined as the total magnetic field that passes through a given area. It measures how much magnetic field is 'flowing' through a loop or surface and is an important concept in electromagnetism, particularly in the context of electromagnetic induction.

In the context of electromagnetic theory, the weber can be understood as the amount of magnetic field that, when linked with a single turn of wire, produces one volt of electromotive force when the magnetic field changes at a rate of one weber per second. This relationship highlights the interdependence between magnetic flux and electric potential, further underscoring the significance of the weber in electrical engineering.

Other units mentioned, such as illuminance, power, and voltage, measure different physical quantities. Illuminance measures the intensity of light in a given area, power measures the rate of energy transfer, and voltage represents the electric potential difference between two points. Each of these units serves distinct roles in the fields of physics and engineering, illustrating why they are not applicable in the context of measuring magnetic flux.