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Encyclopedia > Joule heating

In electronics, and in physics more broadly, Joule 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 electrical devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ... When stuff moves. ... 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. ... In electricity, current refers to electric current, which is the flow of electric charge. ...

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 subatomic particle. ... In physics, momentum is a physical quantity related to the velocity and mass of an object. ... Kinetic energy (also called vis viva, or living force) is energy possessed by a body by virtue of its motion. ... 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, 1818–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 electrical current. ...

  Results from FactBites:
James Prescott Joule: Definition and Much More from Answers.com (2732 words)
Joule discovered the first law of thermodynamics, which is a form of the law of conservation of energy (see conservation laws).
Joule was influenced by the thinking of Franz Aepinus and tried to explain the phenomena of electricity and magnetism in terms of atoms surrounded by a "calorific ether in a state of vibration".
Joule was a pupil of Dalton and it is no surprise that he had learned a firm belief in the atomic theory, even though there were many scientists of his time who were still skeptical.
Metastability and Dynamic Phase Transitions of a Vortex Lattice in Pure 2H-NbSe2 (2678 words)
The effect of Joule heating is detected by comparing the response of the vortex lattice to fixed amplitude current steps of short (10ms) and long (4s) duration, where the Joule heating is negligible and saturates respectively.
While this heating can be accompanied by interesting physical phenomena such as the hotspot effects [1-4], it also causes difficulties in analyzing transport experiments and in determining the physical properties related to the vortex motion, especially at high dissipation levels [5-13].
Joule heating can be reduced significantly by using short pulsed currents [5-7,14] or by applying the current at high ramping rates [8,12].
  More results at FactBites »



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