An electric arc between two nails. An electric arc or arc discharge is an electrical breakdown of a gas that produces an ongoing plasma discharge, resulting from a current through normally nonconductive media such as air.n electric arc differs from a glow discharge in that the current density is quite high, and the voltage drop within the arc is low; at the cathode, the current density can be as high as one megaampere per square centimeter. An electric arc has a non-linear relationship between current and voltage.
According to The Bureau of Labor Statistics, the states hiring the most ultrasound techs, in relation to overall population, were as follows in 2008: 1  Florida. 2  Connecticut. 3  New Jersey. 4  Alabama. Tennessee.
As of 2013, there were a total of 1,330 diagnostic medical sonographers employed in the state with future employment numbers expected to reach 1,720 by 2020. Massachusetts is one of the top paying states for ultrasound technicians, and its median annual salary $80,500 is significantly higher than the national median. Employment for ultrasound technicians in Massachusetts is projected to grow 41% between 2010 and 2020.