sum transformer
21Conference matrix — In mathematics, a conference matrix (also called a C matrix) is a square matrix C with 0 on the diagonal and +1 and −1 off the diagonal, such that CTC is a multiple of the identity matrix I. Thus, if the matrix has order n, CTC = (n−1)I …
22List of vacuum tubes — This is a list of vacuum tubes or thermionic valves. Before the advent of semiconductor devices, hundreds of tube types were used in consumer and industrial electronics; today only a few types are still used in specialized applications. Contents… …
23building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
24Khmelnytskyi, Ukraine — Infobox Settlement English name = Khmelnytskyi official name = Khmelnytskyi native name = Хмельницький nickname= imagesize = image caption = imagesize = image caption = image shield = Khmelnitsky COA.png nickname = motto = mapsize = 250px map… …
25National Grid (UK) — The National Grid is the high voltage electric power transmission network in Great Britain, connecting power stations and major substations and ensuring that electricity generated anywhere in Great Britain can be used to satisfy demand elsewhere …
26Pickup (music) — A pickup device acts as a transducer that captures mechanical vibrations (usually from suitably equipped stringed instruments such as the electric guitar, electric bass guitar or electric violin) and converts them to an electrical signal, which… …
27AC power — This article deals with power in AC systems. See Mains electricity for information on utility supplied AC power. Usually hidden from the unaided eye, the blinking of (non incandescent) lighting powered by AC mains is revealed in this motion… …
28Moving parts — This article is about machinery and engineering. For the rock band, see Moving Parts. For the musical album, see Fewer Moving Parts. some of the moving parts of an automobile engine The moving parts of a machine are those parts of it that move.… …
29Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …
30Synchro — [ frame|Schematic of Synchro TransducerThe complete circle represents the rotor. The solid bars represent the cores of the windings next to them. Power to the rotor is connected by slip rings and brushes, represented by the circles at the ends of …
