DCR - Direct Current Resistance


Xmultiple's Engineering Department

Direct Current Resistance V The DCR is defined as the resistance of an inductor as a result of the resistance of the wire used in the winding.

Conductors and Resistors

Objects such as wires that are designed to have low resistance so that they transfer current with the least loss of electrical energy are called conductors. Objects that are designed to have a specific resistance so that they can dissipate electrical energy or otherwise modify how a circuit behaves are called resistors. Conductors are made of highly conductive materials such as metals, in particular copper and aluminium. Resistors, on the other hand, are made of a wide variety of materials depending on factors such as the desired resistance, amount of energy that it needs to dissipate, precision, and cost.

DC resistance

The resistance of a given resistor or conductor grows with the length of conductor and specific resistivity of the material, and decreases for larger cross-sectional area. The resistance R and conductance G of a conductor of uniform cross section. Resistivity is a measure of the material's ability to oppose electric current.

AC resistance

A wire carrying alternating current has a reduced effective cross sectional area because of the skin effect. Adjacent conductors carrying alternating current have a higher resistance than they would in isolation or when carrying direct current, due to the proximity effect. At commercial power frequency, these effects are significant for large conductors carrying large currents, such as busbars in an electrical substation or large power cables carrying more than a few hundred amperes.

When an alternating current flows through the circuit, its flow is not opposed only by the circuit resistance, but also by the opposition of electric and magnetic fields to the current change. That effect is measured by electrical reactance. The combined effects of reactance and resistance are expressed by electrical impedance.


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