How Do They Do It? How Do They Do It? How Do They Do It? is a television series produced by Wag TV for Discovery Channel. Each programme explores how 2 or 3 ordinary objects are made and used. The show's slogan is "Behind the ordinary is the extraordinary." The series is broadcast throughout the world on various Discovery-owned networks including: Series 1 and 2, which were co-produced with Rocket Surgery Productions, were narrated by Rupert Degas; series 3 and 4 were narrated by Iain Lee; and series 5 and 6 were narrated by Dominic Frisby. In 2008, the UK's Channel 5 began airing the
Symmetrical components Symmetrical components In electrical engineering, the method of symmetrical components simplifies analysis of unbalanced three-phase power systems under both normal and abnormal conditions. The basic idea is that an asymmetrical set of "N" phasors can be expressed as a linear combination of "N" symmetrical sets of phasors by means of a complex linear transformation. In the most common case of three-phase systems, the resulting "symmetrical" components are referred to as "direct" (or "positive"), "inverse" (or "negative") and "zero" (or "homopolar"). The analysis of power system is much simpler in the domain of symmetrical components, because the resulting equations are mutually