A particulate air filter is a device composed of, or materials which removes such as,,,, and from the . Filters containing an or such as (carbon) may also remove and gaseous pollutants such as or . Air filters are used in applications where is important, notably in building sy.
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Toroidal inductors and transformers are and which use with a (ring or donut) shape. They are , consisting of a circular ring or donut shaped of material such as, iron powder, or, around which is wound. Although closed-core inductors and transformers often use cores with a rectangular.
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An inductor stores energy exclusively in the form of a magnetic field. Unlike capacitors which store energy in an electric field between two conductive plates, or batteries which store energy chemically, an inductor converts electrical energy into magnetic potential energy.
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