Ohm's law Quick reference
World Encyclopedia
...'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.)
...'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.)
...’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.)
...’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.)
...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
...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.)
...’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.)
...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.)
...’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.)
...'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.)
...'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
...'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.)
...'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
Ohm's acoustic law
Georg Simon Ohm
Electrical Conductivity in Metals
Ohm, Georg Simon (1787–1854) Quick reference
A Dictionary of Physics (8 ed.)
...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.)
...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.)
...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 . ...
