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## Ohm's law

The ratio of the potential difference between the ends of a conductor to the current flowing through it is constant. This constant is the resistance of the conductor, i.e. V = IR, where V ...

## Ohm's law Quick reference

### World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
71 words

...'s law Statement that the amount of steady current through a material is proportional to the voltage across the material. For example, if the voltage doubles then the current also doubles. Proposed in 1827 by the German physicist Georg Ohm ( 1787–1854 ), Ohm's law is expressed mathematically as V = IR (where V is the voltage in volts, I is the current in amperes, and R is the resistance in ohms...

## Ohm's law Reference library

### Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
49 words

...'s law a law stating that under constant conditions the current, I , flowing through a given conductor is proportional to the potential difference, U , applied across it. The law is often expressed in the form U = IR , where the proportionality constant, R , is the resistance of the...

## Ohm’s law Quick reference

### A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
106 words
Illustration(s):
2

...’s law The electric current, I , flowing in a conductor or resistor is linearly proportional to the applied potential difference, V , across it. From the definition of resistance , R , Ohm’s law can be written: V = I R Any electrical component, circuit, or device that maintains such a linear relationship between current and voltage can be described as ohmic . The form of Ohm’s law at a particular point is given by J = σ E which relates the current density J at a point to the electric field E at that point and the conductivity σ of the material. ...

## Ohm’s law Quick reference

### A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

...’s law A law that states that the current flowing between two points in a circuit is directly proportional to the voltage within that...

## Ohm’s law Quick reference

### A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
101 words

...Ohm’s law The ratio of the potential difference between the ends of a conductor to the current flowing through it is constant. This constant is the resistance of the conductor, i.e. V = IR , where V is the potential difference in volts, I is the current in amperes, and R is the resistance in ohms. The law was discovered in 1827 by Georg Ohm . Most materials do not obey this simple linear law; those that do are said to be ohmic but remain so only if physical conditions, such as temperature, remain constant. Metals are the most accurately ohmic...

## Ohm’s law Quick reference

### A Dictionary of Energy Science

Reference type:
Subject Reference
Current Version:
2017

...Ohm’s law The relationship between the voltage drop V across a resistor of value R and the current flow through the resistor I given by V = IR . The power dissipated in the resistor is equal to IV = I   2 R = V   2 / R ....

## Ohm’s law Quick reference

### A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...’s law The ratio of the voltage ( V ) applied to a conductor and the electric current ( I ) caused to flow through it at constant temperature is constant, and is the electrical resistance ( R ) of the conductor, such that V / I = R . At high current densities the law may break down for some...

## Ohm’s law Quick reference

### A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...Ohm’s law The electric current I (unit A), i.e. the rate of flow of electric charge (usually by electrons), between two points of a material is directly proportional to the voltage difference V (unit V) across the two points: I = V/R , where R is the resistance of the material (unit Ω ‎). The value of R depends upon the sample size and shape whereas the material property resistivity ρ ‎ (unit Ω ‎.m) is independent. Resistivity is defined by ρ ‎ = RA/L , where L is the distance between the two points and A is the cross-sectional area normal...

## Ohm’s acoustic law n. Quick reference

### A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...’s acoustic law n . The proposition that the human auditory system responds to a complex sound by generating sensations of the separate components of the sound rather than a sensation of a single integrated sound; thus when we listen to an orchestra we hear the separate instruments although the ears receive only a single complex sound wave. See also Fourier analysis . [Named after the German physicist Georg Simon Ohm ( 1784–1854 ) who formulated it in 1843...

## Ohm's law Quick reference

### New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
34 words

...'s law Physics a law stating that electric current is proportional to voltage and inversely proportional to resistance . Ohms law Ohm's law law stating that electric current is proportional to voltage scientific principle...

## Ohm's law noun Quick reference

### Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
39 words

...'s law / əʊmz / ▶ noun Physics a law stating that electric current is proportional to voltage and inversely proportional to resistance . Ohms law law stating that electric current is proportional to voltage scientific principle Electrical Ohm's ...

## Ohm's law noun Reference library

### The New Zealand Oxford Dictionary

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
28 words

...'s law / oʊmz / ▶ noun Electr. a law stating that current is proportional to voltage and inversely proportional to resistance . – origin see Ohm, Georg Simon...

## Ohm's law noun Reference library

### Australian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2004
Subject:
English Dictionaries and Thesauri
Length:
38 words

...'s law / oʊmz / ▶ noun Electr. a law stating that current is proportional to voltage and inversely proportional to resistance . – origin named after the German physicist Georg Simon Ohm ( 1789–1854 ), who developed the law...

## Ohm's law

The ratio of the potential difference between the ends of a conductor to the current flowing through it is constant. This constant is the resistance of the conductor, i.e. V = IR, where V is the ...

## Ohm's acoustic law

The proposition that the human auditory system responds to a complex sound by generating sensations of the separate components of the sound rather than a sensation of a single integrated sound; thus ...

## Georg Simon Ohm

Reference type:
Overview Page
(1787–1854) German physicist,who taught in Cologne, Berlin, Nuremberg, and finally (1849) Munich. He is best known for formulating Ohm's law in 1827. The unit of electrical resistance is named after ...

## Electrical Conductivity in Metals

Elementary conductivity theory is an extension of free electron theory, in which the electrons in a metal are treated as a gas of negatively charged free particles. In a metallic crystal, the average ...

## Ohm, Georg Simon (1787–1854) Quick reference

### A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
40 words

...Ohm, Georg Simon ( 1787–1854 ) German physicist , who taught in Cologne, Berlin, Nuremberg, and finally ( 1849 ) Munich. He is best known for formulating Ohm’s law in 1827 . The unit of electrical resistance is named after...

## electrical resistivity Quick reference

### A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...electrical resistivity ( ρ ‎ ) (Unit Ω ‎ .m) Electrical resistivity is a material property which quantifies the resistance to the flow of electric current through a material. It is the inverse of electrical conductivity. See also Ohm’s law...

## ohmmeter Quick reference

### A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...An instrument used to measure electrical resistance . The most common type, as found in multimeters , applies a known voltage to the element whose resistance is to be determined and measures the resulting current using an ammeter ; the resistance is then determined by Ohm’s law . More specialized and accurate ways to measure resistance involve the use of galvanometers . ...

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