electrical resistance

Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Wikipedia.

Electrical resistance

Opposition of a circuit to the flow of electric current. Ohm's law states that the current I flowing in a circuit is proportional to the applied potential difference V. The constant of proportionality is defined as the resistance R. Hence, Eq. (1)

holds. If V and I are measured in volts and amperes, respectively, R is measured in ohms. Microscopically, resistance is associated with the impedance to flow of charge carriers offered by the material. For example, in a metallic conductor the charge carriers are electrons moving in a polycrystalline material in which their journey is impeded by collisions with imperfections in the local crystal lattice, such as impurity atoms, vacancies, and dislocations. In these collisions the carriers lose energy to the crystal lattice, and thus Joule heat is liberated in the conductor, which rises in temperature. The Joule heat P is given by
Eq. (2). See Crystal defects, Electrical resistivity, Joule's law, Ohm's law

electrical resistance

[i′lek·trə·kəl ri′zis·təns]

electrical resistance

The physical property of a device, conductor, element, branch, or system, by virtue of which power is lost as heat when current flows through it; the physical property which an electric conductor exhibits to the flow of current; measured in ohms.
References in periodicals archive ?
Electrical resistance of nontreated pole sections tended to be very small and uniform across the four applied voltages and there was little variation among the six pole sections at the start of the test (Fig.
In figure 5 are presented electrical resistance determinations at 2 tested oils.
In an earlier paper, we studied the interface in mechanically fastened steel joint by contact electrical resistance measurement and unexpectedly found that the steel-steel joint exhibits irreversible change upon repeated fastening (loading) and unfastening (unloading), even though the compressive stress is just 7% (or less) of the yield strength [6].
The researchers also studied various effective parameters such as time, temperature, and other physical conditions on the changes in electrical resistance of the sample nanosensor.
The new high-pressure corrosion monitoring probe adapter for both Microcor[R] and Corrosometer[R] electrical resistance corrosion probes have a hermetically sealed connector and are pressure-rated up to 10,000 psi.
The arrays can then be read by measuring their electrical resistance.
Temptran[TM] temperature transmitters for amplified low-level signals from RTD or thermocouples, immunity to electrical resistance in extension wires and the ability to linearize temp signals for excellent low cost signal conditioners.
The C-2000 is an electrical resistance type moisture meter utilizing the relationship between moisture content and electrical resistance.
Burgess KE in mediumvoltage cable provides maximum long-term wet electrical resistance.
Volume resistivity, as determined by ASTM D257, is a measure of bulk electrical resistance.
In some past studies, scientists found unexpected quantum mechanical variations in electrical resistance that became known as the quantum Hall effect (SN: 2/22/03, p.

Full browser ?