Ohm's law


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Related to Ohm's law: Kirchoff's Law

Ohm's law

 [ōmz]
a mathematical relationship formulated by the German physicist Georg Simon Ohm in 1826, comparing voltage (V), current (I), and resistance (R), usable for either alternating current or direct current. It originally applied only to situations of steady direct current, with the formula V = IR; with alternating current, the electrical circuit contains resistors, inductors, and capacitors and the formula becomes V = IZ, where Z is a complex number representing the impedance.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

Ohm's law

(omz)
[Georg S. Ohm, Ger. physicist, 1789–1854]
The strength of an electric current, expressed in amperes, is equal to the electromotive force, expressed in volts, divided by the resistance, expressed in ohms (V=IR).
See: electricity
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References in periodicals archive ?
This differs from our treatment where EP does not replace B but contributes to it via the modified Ohm's law. Nevertheless, the form that is given in (24) allows one to study magnetosphere-ionosphere coupling as was demonstrated in [39].
In the transformed primed system Ohm's law also has a tensor form.
Figure 3 shows the electrical conductivity of the solutions measured by conductivity meter and calculated using Ohm's law versus vol% of water.
By neglecting spatial variations in solution concentration, the single particle model is able to: (1) represent each battery electrode by a single spherical diffusion particle (hence the model's name), (2) eliminate the need for solving Fick's law of diffusion for the solution, (3) replace Ohm's law for both the solid and electrolytic media by lumped equivalent resistors.
When students compute electrical circuit problems, they must identify the correct mathematical algorithm before computing the solution by using Ohm's Law. Transforming the initial situation into the desired goal requires mental and behavioral activities (Chi & Glaser, 1985).
Returning to the example of my personal verification of Ohm's law given earlier, I think it likely that PK could, in principle, affect an electrical current, and so could create apparent "violations" of Ohm's law.
Ohm's Law, V=IR, holds that voltage (V)equals current (I)times resistance (R).
For many reasons, some of the historical (biologists are less adventurous than other scientists about plumbing the innards of analytical instruments) HPLC is evolving into what Tom Jupille, President of LC Resources (Walnut Creek, CA), calls "laboratory appliances." Users have little time or inclination for priming pumps, unclogging injectors, hunting down tools, or poring through 350-page dissertations on Ohm's law. "Instruments are a means to an end," Jupille notes.
This noise consists of the dynamic AC voltage fluctuation due to the frequency-dependent distributed parasitics inherent in today's power distribution systems, and the DC voltage drop (i.e., "IR" drop, according to Ohm's Law V=I*R, where R is the equivalent path DC resistance between the source location and the device location and I is the average current the chip draws from the supply).
He introduces the connection between the symbolic postulation of Ohm's Law and reality by describing the relationship between the abstract terms of the physicist such as 'current,' 'resistance,' 'electromotive force,' and the 'everyday English' terms such as 'wire,' 'position of the needle,' etc.
Since this exponent is so close to unity, the current essentially follows Ohm's law in this range of forward bias.
This site allows students to derive Ohm's law from experimental trial and error using different components of a "virtual" circuit.