An electric arc, or arc discharge, is an electrical breakdown of a gas that produces a prolonged electrical discharge.
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25 Facts About Electric arc
2.
An Electric arc discharge is characterized by a lower voltage than a glow discharge and relies on thermionic emission of electrons from the electrodes supporting the Electric arc.
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3.
Electric arc called it an arc because it assumes the shape of an upward bow when the distance between the electrodes is not small.
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4.
Electric arc's petitioned to present a paper before the Royal Society, but she was not allowed because of her gender, and "The Mechanism of the Electric Arc" was read by John Perry in her stead in 1901.
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5.
An electric arc is the form of electric discharge with the highest current density.
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Royal Society6.
The maximum current through an Electric arc is limited only by the external circuit, not by the Electric arc itself.
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7.
An Electric arc is distinguished from a glow discharge partly by the similar temperatures of the electrons and the positive ions; in a glow discharge, the ions are much colder than the electrons.
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8.
Electrical resistance along the continuous electric arc creates heat, which ionizes more gas molecules, and as per this sequence: solid-liquid-gas-plasma; the gas is gradually turned into a thermal plasma.
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9.
Current in the Electric arc is sustained by thermionic emission and field emission of electrons at the cathode.
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10.
Unlike a glow discharge, an Electric arc has little discernible structure, since the positive column is quite bright and extends nearly to the electrodes on both ends.
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11.
The Electric arc occurs in the gas-filled space between two conductive electrodes and it results in a very high temperature, capable of melting or vaporizing most materials.
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12.
An electric arc is a continuous discharge, while the similar electric spark discharge is momentary.
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13.
An electric arc has a non-linear relationship between current and voltage.
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14.
Once the Electric arc is established, increased current results in a lower voltage between the Electric arc terminals.
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15.
Electric arc furnaces are used to produce steel and other substances.
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16.
Formation of an intense electric arc, similar to a small-scale arc flash, is the foundation of exploding-bridgewire detonators.
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17.
Once ignited, the Electric arc will move upwards along the wires and will break down when the distance between the wires will become too large.
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18.
The Electric arc can be broken by a blast of compressed air or another gas.
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19.
An undesirable Electric arc can occur when a high-voltage switch is opened and is extinguished in similar ways.
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20.
The Electric arc current is interrupted at the moment within an AC cycle when the current goes to zero and the highly electronegative SF6 ions quickly absorb free electrons from the decaying plasma.
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21.
Apart from the anode and cathode voltage drops, the arc behaves almost as a short circuit, drawing as much current as the electrical power supply can deliver, and the heavy load dramatically reduces the voltage across the gap.
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22.
The Electric arc could hit an obstacle and reform on the other side of the obstacle.
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23.
An arc flash describes an explosive electrical event that presents a hazard to people and equipment.
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24.
An Electric arc formed in air will ionize oxygen and nitrogen, which then can re-form into reactive molecules such as ozone and nitric oxide.
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25.
An Electric arc that occurs outside is less of a hazard because the heated ionized gases will rise up into the air and dissipate into the atmosphere.
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