Hall effect. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electricity for beginners
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The Hall effect was discovered in 1879 by the American scientist Edwin Herbert Hall. Its essence is as follows (see figure).
If a current is passed through a conducting plate, and a magnetic field is directed perpendicular to the plate, then a voltage will appear on the plate in the direction transverse to the current (and the direction of the magnetic field):
Uh = (RhHIsinw)/d,
where Rh is the Hall coefficient depending on the material of the conductor; H is the magnetic field strength; I - current in the conductor; w is the angle between the current direction and the magnetic field induction vector (if w = 90°, sin w = 1); d is the thickness of the material.
Due to the fact that the output effect is determined by the product of two quantities (H and I), Hall sensors have a very wide application [1].
The table shows the Hall coefficients for various metals and alloys. Designations: T - temperature; B - magnetic flux; Rh - Hall coefficient in units of m3/C.
References:
- Hall sensors and their application // Radioamator-Konstruktor. -2000. -#1. -p.18.
See other articles Section Electricity for beginners.
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