An Electric arc.

An electric arc is an electrical breakdown of a gas which produces an ongoing plasma discharge, resulting from a current flowing through normally nonconductive media such as air. A synonym is arc discharge. The phenomenon was first described by Vasily V. Petrov, a Russian scientist who discovered it in 1802. An archaic term is voltaic arc as used in the phrase "voltaic arc lamp".
Uses: Industrially, electric arcs are used for welding, plasma cutting, for electrical discharge machining, as an arc lamp in movie theater projectors, and Followspots in stage lighting. Electric arc furnaces are used to produce steel and other substances. Calcium carbide is made in this way as it requires a large amount of energy to promote an endothermic reaction (at temperatures of 2500 °C).
Calcium carbide is a chemical compound with the chemical formula of CaC2. The material is colorless, but most samples appear black through to grayish white lumps, depending on the grade. Its main use industrially is in the production of acetylene.
Low-pressure electric arcs are used for lighting, e.g., fluorescent tubes, mercury and sodium street lamps, and camera flash lamps. Electric arcs have been studied for electric propulsion of spacecraft.

Answer the questions, based on the dialog above, and translate the answers.
Some answers will be found on the internet.

1. What is an electric arc? _______________________________

________________________________________________

2. When was this phenomenon first described by? _____________

_______________________________________________

3. In what year was this phenomenon discovered? __________

______________________________________________

4. What are industrial electric “arcs” used for? ______________

_____________________________________________

5. What are Electric arc furnaces used for? ________________

_____________________________________________

6. What is Calcium carbide? __________________________

____________________________________________

7. What is it’s main use industrially? _____________________

_____________________________________________

8. What are low-presure electric arcs used for? _____________

_____________________________________________

9. What are electric arcs been studied for? ________________

____________________________________________