electric-arc

electric arc

noun
arc ( def 2 ).

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
electric arc  
An electric current, often strong, brief, and luminous, in which electrons jump across a gap. Electric arcs across specially designed electrodes can produce very high heats and bright light, and are used for such purposes as welding and illumination in spotlights. Unwanted arcs in electrical circuits can cause fires. Lightning is a case of an electric arc between one cloud and the earth or another cloud, as are sparks caused by discharges of static electricity.
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