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Encyclopedia > Ohmic heating

In electronics, and in physics more broadly, Joule heating or ohmic heating refers to the increase in temperature of a conductor as a result of resistance to an electrical current flowing through it. Two digital voltmeters The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ... Since antiquity, people have tried to understand the behavior of matter: why unsupported objects drop to the ground, why different materials have different properties, and so forth. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... It has been suggested that Conductor (power engineering) be merged into this article or section. ... Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ... Jump to: navigation, search In electricity, current refers to electric current, which is the flow of electrons. ...

At an atomic level, Joule heating is the result of moving electrons colliding with atoms in a conductor, whereupon momentum is transferred to the atom, increasing its kinetic energy (see heat). Properties For alternative meanings see atom (disambiguation). ... Properties The electron is a fundamental subatomic particle which carries a negative electric charge. ... In physics, momentum is a physical quantity related to the velocity and mass of an object. ... Jump to: navigation, search Kinetic energy is energy that a body has as a result of its speed. ... A red-hot iron rod cooling after being worked by a blacksmith. ...

Joule heating is named for James Prescott Joule, the first to articulate what is now Joule's law, relating the amount of heat released from an electrical resistor to its resistance and the charge passed through it. James Prescott Joule (December 24, 1818â€“October 11, 1889) was an English physicist, born in Salford, near Manchester. ... Joules law (due to James Prescott Joule) expresses the amount of heat generated by an electrical resistor, and is expressed by the relation by current flowing through a resistor with resistance for a time , and is the heat generated or where is the constant of proportionality, dependent on the...

When similar collisions cause a permanent structural change, rather than an elastic response, the result is known as electromigration. Electromigration is the transport of material caused by the gradual movement of the ions in a conductor due to the momentum transfer between conducting electrons and diffusing metal atoms. ...

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 FDA/CFSAN: Kinetics of Microbial Inactivation for Alternative Food Processing Technologies -- Ohmic and Inductive ... (4298 words) Ohmic heating (sometimes also referred to as Joule heating, electrical resistance heating, direct electrical resistance heating, electroheating, and electroconductive heating) is defined as a process wherein (primarily alternating) electric currents are passed through foods or other materials with the primary purpose of heating them. Ohmic heating is distinguished from other electrical heating methods either by the presence of electrodes contacting the food (as opposed to microwave and inductive heating, where electrodes are absent), frequency (unrestricted, except for the specially assigned radio or microwave frequency range), and waveform (also unrestricted, although typically sinusoidal). Inductive heating may be distinguished from microwave heating by the frequency (specifically assigned in the case of microwaves), and the nature of the source (the need for coils and magnets for generation of the field, in the case of inductive heating, and a magnetron for microwave heating).
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