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 for three phase voltage components can be written as and decomposing the vector into three symmetrical components gives where the subscripts 0, 1, and 2 refer respectively to the zero, positive, and negative sequence components. The sequence components differ only by their phase angles, which are symmetrical and so are formula_3 radians or 120°. Define a phasor rotation operator alpha, which rotates a phasor vector counterclockwise by 120 degrees: Note that α = 1 so that α = α. The zero sequence components have equal magnitude and in phase with each other, therefore: and the other phase sequences have the