![]() According to modern science, Davy's description was a spark rather than an arc. In 1801, he described the phenomenon in a paper published in William Nicholson's Journal of Natural Philosophy, Chemistry and the Arts. Sir Humphry Davy discovered the short-pulse electrical arc in 1800. ![]() Natural lightning is now considered an electric spark, not an arc. Electric arcs can be utilized for manufacturing processes, such as electric arc welding, and electric arc furnaces for steel recycling. For example, fluorescent tubes, mercury, sodium, and metal-halide lamps are used for lighting xenon arc lamps have been used for movie projectors. Some low-pressure electric arcs are used in many applications. In the late 19th century, electric arc lighting was in wide use for public lighting. Techniques for arc suppression can be used to reduce the duration or likelihood of arc formation. An archaic term is voltaic arc, as used in the phrase "voltaic arc lamp". An arc discharge is characterized by a lower voltage than a glow discharge and relies on thermionic emission of electrons from the electrodes supporting the arc. The current through a normally nonconductive medium such as air produces a plasma the plasma may produce visible light. An electric arc (or arc discharge) is an electrical breakdown of a gas that produces a prolonged electrical discharge.
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