Eczema is a common skin problem that is also sometimes called atopic dermatitis. It usually affects babies and young children, but adults can develop it, too. This inflammatory skin condition is often believed to be an allergic reaction, but the cause is unknown.
The potential of each line of a three-phase system is displaced from the other two by 120 electrical degrees. The sequence, or order, in which the potential of each line reachâ¦es its peak value is termed the 'phase sequence' of the system.
Phase difference, also called phase angle, in degrees is conventionally defined as a number greater than -180, and less than or equal to +180. Leading phase refers to a wave that occurs ahead of another wave of the same frequency. Lagging phase refers to a wave that occurs behind another wave of the same frequency. When two signals differ in phase by -90 or +90 degrees, they are said to be in phase quadrature.