Electrical resistance shares some conceptual parallels with mechanical friction. Its reciprocal quantity is electrical conductance, measuring the ease with which an electric current passes. La resistencia elctrica de un componente o aparato del circuito se define como la proporcin entre el voltaje aplicado y la intensidad de corriente elctrica que fluye a su travs: Si la resistencia es constante sobre un considerable rango de voltajes, entonces se puede usar la ley de Ohm , I V/R, para predecir el comportamiento del material.China Resistencia Electrica Caracol Induction Cooker Four Digital Display, Find details and Price about China Electrsch Koken Plat Onder Pen, Resistencia.The electrical resistance of an object is a measure of its opposition to the flow of electric current.

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.The resistivity of different materials varies by an enormous amount: For example, the conductivity of teflon is about 10 30 times lower than the conductivity of copper. Similarly, if two conductors near each other carry AC current, their resistances increase due to the proximity effect. For this reason, the geometrical cross-section is different from the effective cross-section in which current actually flows, so resistance is higher than expected.

For the case of electrolyte solutions, see the article: Conductivity (electrolytic).Resistivity varies with temperature. More details can be found in the article: Electrical resistivity and conductivity. Semiconductors lie between these two extremes. In an insulator, such as Teflon, each electron is tightly bound to a single molecule so a great force is required to pull it away.

However, unlike ohmic resistance, non-linear resistance is not constant but varies with the voltage or current through the device i.e., its operating point. These are called non-ohmic or non-linear, and their currentвЂ“voltage curves are not straight lines through the origin.Resistance and conductance can still be defined for non-ohmic elements. See below.The currentвЂ“voltage curve of a component with negative differential resistance, an unusual phenomenon where the currentвЂ“voltage curve is non- monotonic.Many electrical elements, such as diodes and batteries do not satisfy Ohm's law.