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History
Joule heating
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Joule heating is the process by which the passage of an electric current through a conductor produces heat.
An incandescent light bulb's filament emitting light
An incandescent light bulb's filament emitting light
Electric radiative space heater
Electric radiative space heater
Electric tabletop hotplate
Electric tabletop hotplate
Clothes iron used to remove wrinkles from clothes
Clothes iron used to remove wrinkles from clothes
Electrical resistance and conductance
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The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is electrical conductance, measuring the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with mechanical friction. The SI unit of electrical resistance is the ohm, while electrical conductance is measured in siemens (S).
An ohmmeter
An ohmmeter
Running current through a material with resistance creates heat, in a phenomenon called Joule heating. In this picture, a cartridge heater, warmed by
Running current through a material with resistance creates heat, in a phenomenon called Joule heating. In this picture, a cartridge heater, warmed by Joule heating, is glowing red hot.