fortune definition: The definition of fortune is wealth, good luck or what is going to happen. (noun) An example of fortune is what someone had after inheriting millions of dollars. An example of fortune is the luck of having oil discovered on an ot...
1 Polarity (physics), a physical alignment of atoms. 2  Cell polarity, differences in the shape, structure, and function of cells. 3  Chemical polarity, a concept in chemistry which describes how equally bonding electrons are shared between atoms.  Polar reciprocation, a concept in geometry also known as polarity.
The terms straight and reverse polarity are used around the shop. They may also be expressed as electrode-negative and electrode-positive polarity. The latter terms are more descriptive and will be used throughout this article. Polarity results from the fact that an electrical circuit has a negative and a positive pole. Direct current (DC) flows in one direction, resulting in a constant polarity. Alternating current (AC) flows half the time in one direction and half the time in the other, changing its polarity 120 times per second with 60-hertz current. A welder should know the meaning of polarity, and recognize what effect it has on the welding process.