With no disc you could be sure of, it looked like an electric arc.
In fact, it has properties that are similar to an electric arc.
In the 19th century, a number of men had employed an electric arc to melt iron.
An electric arc can be produced by several methods.
An electric arc has a non-linear relationship between current and voltage.
Certain foods such as grapes, if carefully arranged, can produce an electric arc.
An electric arc from the table corner zapped my bare hand.
Ayrton also began her own investigation into the characteristics of the electric arc.
Also, the flux is always making the pocket of gas which keeps the electric arc from going out.
Some kinds of welding do not use an electric arc.