In such conditions, Ohm's law states that the current is directly proportional to the potential difference between two ends ( across ) of that metal ( ideal ) resistor ( or other ohmic device ):

* Ohm's law: The voltage across a resistor is equal to the product of the resistance and the current flowing through it.

These experiments are used to prove, verify, and reinforce laws and theorems such as Ohm's law, Kirchhoff's laws, etc.

The Fick's law is analogous to the relationships discovered at the same epoch by other eminent scientists: Darcy's law ( hydraulic flow ), Ohm's law ( charge transport ), and Fourier's Law ( heat transport ).

File: Georg Simon Ohm3. jpg | Georg Ohm ( 1789-1854 ): found that there is a direct proportionality between the electric current I and the potential difference ( voltage ) V applied across a conductor, and that this current is inversely proportional to the resistance R in the circuit, or I = V / R, known as Ohm's law, namesake of the unit of electrical resistance ( the ohm )

This relationship is represented by Ohm's law:

The behavior of an ideal resistor is dictated by the relationship specified by Ohm's law:

Ohm's law states that the voltage ( V ) across a resistor is proportional to the current ( I ), where the constant of proportionality is the resistance ( R ).

Equivalently, Ohm's law can be stated:

The resistance of the sample is given by Ohm's law as R = V / I.

Note that this formula ( equivalent to Newton's law of heat flow ) is analogous to, and much older than, Ohm's law of electric flow:

V, I, and R, the parameters of Ohm's law.

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.

More specifically, Ohm's law states that the R in this relation is constant, independent of the current.

The above equation is the modern form of Ohm's law.

In physics, the term Ohm's law is also used to refer to various generalizations of the law originally formulated by Ohm.

This reformulation of Ohm's law is due to Gustav Kirchhoff.

Ohm's law was probably the most important of the early quantitative descriptions of the physics of electricity.

In the 1850s, Ohm's law was known as such, and was widely considered proved, and alternatives such as " Barlow's law " discredited, in terms of real applications to telegraph system design, as discussed by Samuel F. B. Morse in 1855.

The standard ampere is most accurately realized using a watt balance, but is in practice maintained via Ohm's Law from the units of electromotive force and resistance, the volt and the ohm, since the latter two can be tied to physical phenomena that are relatively easy to reproduce, the Josephson junction and the quantum Hall effect, respectively.

A simple electric circuit, where current is represented by the letter i. The relationship between the voltage ( V ), resistance ( R ), and current ( I ) is V = IR ; this is known as Ohm's Law.

This is an application of Ohm's Law.

As a simple example, if the voltage across the thermistor is held fixed, then by Ohm's Law we have and the equilibrium equation can be solved for the ambient temperature as a function of the measured resistance of the thermistor:

The ability to quantitatively measure voltage and current allowed Georg Ohm to formulate Ohm's Law, which states that the voltage across a conductor is directly proportional to the current through it.

According to the following equation, derived from Ohm's Law, the value of the resistance ( R ) is given by:

Ohm's law is one of the basic equations used in the analysis of electrical circuits.

Modern developments in electromagnetic theory and circuit theory do not contradict Ohm's law when they are evaluated within the appropriate limits.

In circuit analysis, three equivalent expressions of Ohm's law are used interchangeably:

Resistors are circuit elements that impede the passage of electric charge in agreement with Ohm's law, and are designed to have a specific resistance value R. In a schematic diagram the resistor is shown as a zig-zag symbol.

Resistors which are in series or in parallel may be grouped together into a single " equivalent resistance " in order to apply Ohm's law in analyzing the circuit.

When reactive elements such as capacitors, inductors, or transmission lines are involved in a circuit to which AC or time-varying voltage or current is applied, the relationship between voltage and current becomes the solution to a differential equation, so Ohm's law ( as defined above ) does not directly apply since that form contains only resistances having value R, not complex impedances which may contain capacitance (" C ") or inductance (" L ").

Ohm's law, in the form above, is an extremely useful equation in the field of electrical / electronic engineering because it describes how voltage, current and resistance are interrelated on a " macroscopic " level, that is, commonly, as circuit elements in an electrical circuit.

A corollary of Faraday's Law, together with Ampère's law and Ohm's law is Lenz's law: The EMF induced in an electric circuit always acts in such a direction that the current it drives around the circuit opposes the change in magnetic flux which produces the EMF.

By Ohm's law, is simply the source voltage divided by the total circuit resistance:

The law applies to any circuit that obeys Ohm's law, that is, that conducts a current proportional to the voltage across it, or equivalently, that can be characterized by a resistance.

Ohm's law states that for a voltage V across a circuit of resistance R the current will be:

The relation is actually more generally applicable than either Joule's law or Ohm's law, as it represents the instantaneous power being applied to a circuit with voltage V across it and current I into it, whether the circuit is resistive or not.

Note that the current,, in the circuit behaves as the voltage across R does, via Ohm's Law.

The long-tail resistor circuit bias points are largely determined by Ohm's Law and less so by active component characteristics.

He researched the use of complex numbers as applied to Ohm's Law in alternating current circuit theory.

If the lamp failed ( an open circuit ), the current through the string became zero, causing the voltage of the circuit ( thousands of volts ) to be imposed across the insulating film, penetrating it ( see Ohm's law ).

using Hopkinson's law ( magnetic circuit analogue of Ohm's law for electric circuits ) and the definition of magnetomotive force ( magnetic analogue of electromotive force ):

As a result of studying Kirchhoff's circuit laws and Ohm's law, he developed his famous theorem, Thévenin's theorem, which made it possible to calculate currents in more complex electrical circuits and allowing people to reduce complex circuits into simpler circuits called Thévenin's equivalent circuits.

Note that the current,, in the circuit behaves as the voltage across R does, via Ohm's Law.