Redden, Lesley and Dutton, Guillermo (2012) Electrical resistive and electromagnetic components. Academic Studio, Delhi, India. ISBN 9788132308683
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Abstract
The electrical resistance of an electrical element measures its opposition to the passage of al electric current, the inverse quantity is electrical conductance, measuring how easily electric flows along a certain path. Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm (2), while electric conductance is measured in siemens (S). An object of uniform cross section has a resistance proportional to its resistivity and length an inversely proportional to its cross-sectional area. All materials show some resistance, except ft superconductors, which have a resistance of zero. The resistance of an object is defined as the ratio of voltage across it to current through it: R=V/I For a wide variety of materials and conditions, the electrical resistance R is constant for a given temperature; it does not depend on the amount of current through or the potential difference (voltage) across the object. Such materials are called Ohmic materials. For objects made of ohmic materials the definition of the resistance, with R being a constant for that resistor, is known as Ohm's law. In the case of a nonlinear conductor (not obeying Ohm's law), this ratio can change as current or voltage changes; the inverse slope of a chord to an I-V curve is sometimes referred to as a "chordal resistance" or "static resistance".
| Item Type: | Book |
|---|---|
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Electronic Books |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 26 Dec 2023 06:03 |
| Last Modified: | 26 Dec 2023 06:03 |
| URI: | http://odlsystem2.utm.my/id/eprint/4256 |
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