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Inductive and Non-Inductive Resistors

Writer:Microhm Page View:Date:2019-12-03
The induction of a resistor is a very important item to keep in mind when building a circuit, especially if you are dealing with switching or high frequency circuits. The construction of most resistors are very similar to that of an inductor. They take a specific length of wire or film, determined by the resistance value they are trying to achieve, and wrap it around a core made of ceramic, plastic, fiberglass, or another non-conductive material. A non-inductive resistor is wound one way then again in the other direction. This will cancel out the magnetic fields generated by each of the wires. Nual series from Microhm Electronics can be made to non-inductive resistors. High power resistor NLR100  and MVR4618 also an non-inductive resistors.
 Most resistors are created in this same manner but with different materials. For example, film based resistors are using film instead of wire which has proved to be more precise. Ceramic and carbon composition, not to be confused with carbon film, are naturally non-inductive because they don’t have any windings.
 

A non-inductive resistor can be used to replace an inductive resistor, but that might not be a realistic goal. Inductive resistors are typically cheaper to construct and are more commonly made with higher power ratings. Engineers choose inductive or noninductive resistors in terms of the specific application.
 
DC circuits don’t have to worry about the inductance of a resistor since there isn’t any fluctuation in the current to create the altering magnetic fields.
 

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