19 Facts About Ohm's law

Ohm's law is an empirical relation which accurately describes the conductivity of the vast majority of electrically conductive materials over many orders of magnitude of current.

In physics, the term Ohm's law is used to refer to various generalizations of the law; for example the vector form of the law used in electromagnetics and material science:.

Ohm's law measured the current by noting how strong a shock he felt as he completed the circuit with his body.

Ohm's law did not communicate his results to other scientists at the time, and his results were unknown until Maxwell published them in 1879.

Ohm's law found for a dry pile that the relationship between the two parameters was not proportional under certain meteorological conditions.

Ohm's law drew considerable inspiration from Fourier's work on heat conduction in the theoretical explanation of his work.

Ohm's law used a galvanometer to measure current, and knew that the voltage between the thermocouple terminals was proportional to the junction temperature.

Ohm's law then added test wires of varying length, diameter, and material to complete the circuit.

Ohm's law found that his data could be modeled through the equation.

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

Ohm's law is an empirical law, a generalization from many experiments that have shown that current is approximately proportional to electric field for most materials.

Ohm's law has been observed on a wide range of length scales.

Hydraulic analogy to Ohm's law has been used, for example, to approximate blood flow through the circulatory system.

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 schematic diagrams, a resistor is shown as a long rectangle or zig-zag symbol.

Ohm's law holds for circuits containing only resistive elements for all forms of driving voltage or current, regardless of whether the driving voltage or current is constant or time-varying such as AC.

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

Materials and components that obey Ohm's law are described as "ohmic" which means they produce the same value for resistance regardless of the value of V or I which is applied and whether the applied voltage or current is DC of either positive or negative polarity or AC .

Ohm's law assumed that, all else being the same, the flux of heat is strictly proportional to the gradient of temperature.

Physicists who study the electrical properties of matter at the microscopic level use a closely related and more general vector equation, sometimes referred to as Ohm's law, having variables that are closely related to the V, I, and R scalar variables of Ohm's law, but which are each functions of position within the conductor.