**Facts**

**Citations**

**More Facts**

**Equation**

Ohm's Law:

V=I X R (Voltage= Current X Resistance)

Ohm's Law is valid for metallic conductors in direct-current circuits as long as the current is relatively low.

It is generally applied only to direct current (DC) circuits, not alternating current (AC) circuits. In AC circuits, because the current is constantly changing, other factors such as capacitance and inductance must be taken into account.

The tool for measuring volts in an electric circuit is called a voltmeter. An ohmmeter is used for measuring resistance. A multimeter can measure several functions including voltage, current, resistance, and temperature.

Ω is the SI derived unit of electrical resistance.Although several empirically derived standard units for expressing electrical resistance were developed in connection with early telegraphy practice, the British Association for the Advancement of Science proposed a unit derived from existing units of mass, length and time and of a convenient size for practical work as early as 1861.The definition of the "ohm" unit was revised several times. Today the value of the ohm is expressed in terms of the quantum Hall effect.

URL:

http://www.britannica.com/EBchecked/topic/426070/Ohms-law

Article Title:

Ohm's law (physics)

Website Title:

Encyclopedia Britannica Online

Citations

Final Reasearch Project: Ohms: Georg Ohm, Ohm's Law, and stuff

By : Oscar M

Georg Simon Ohm

_The German physicist Georg Simon Ohm (1789-1854) was the discoverer of the law, named for him, which states the exact relationship of potential and current in electric conduction.

_Georg left the University of Erlangen in 1806 after three semesters.

_Following the publication in 1817 of Ohm's first book, a textbook of geometry, he received an appointment as teacher of mathematics and physics at the Royal Prussian Konsistorium in Cologne._In the introductory part of the paper he noted that the new form of his law was not only in perfect agreement with all experiments but also embodied a unitary explanation of a broad range of phenomena. _Consequently, he argued, his law or formula had to be a true law of nature.These remarks of Ohm are important to note as they hold the key to some of the subsequent misunderstanding of his work.

The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1.0 volt, applied to these points, produces in the conductor a current of 1.0 ampere, the conductor not being the seat of any electromotive force

V = volt

A = ampere

m = metre

kg = kilogram

s = second

C = coulomb

J = joule

S = siemens

F = farad

W = watt

URL:

http://biography.yourdictionary.com/georg-simon-ohm

Article Title:

Georg Simon Ohm Facts

Website Title:

Georg Simon Ohm Facts

URL:

http://science.howstuffworks.com/ohms-law-info.htm

Article Title:

Ohm\u0027s Law

Website Title:

HowStuffWorks

Publication date:

2009-08-25

URL:

http://www.allaboutcircuits.com/vol_1/chpt_2/1.html

Article Title:

How voltage, current, and resistance relate

Website Title:

All About Circuits Forum RSS

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