AG Mechanics CDE Practice Exam

The discharge of electricity through an air space is called the:

1. arc

2. electrode

3. slag

4. weld

The correct answer is: arc

The correct answer is 'arc'. When electricity travels through the air, it ionizes the air particles which creates a conducting path known as an arc. This arc is commonly used in welding processes to generate the high temperatures needed to melt metal. In contrast, 'electrode' refers to the metal rod used in welding to carry the electric current, 'slag' is the byproduct of the welding process, and 'weld' is the joint formed when two metals are fused together by the heat of the arc.