de-energize circuit
21Superconducting magnet — A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire can conduct much larger electric currents than ordinary… …
22Direct on line starter — A direct on line starter, often abbreviated DOL starter, is a widely used starting method of electric motors. The term is used in electrical engineering and associated with electric motors. There are many types of motor starters, the simplest of… …
23Control relay — A control relay is an electromechanical device which activates one or more switches according to the current through a coil not connected to the switches. The thyristor is a semiconductor device which carries out similar functions.A relay is… …
24short — Synonyms and related words: 3 D, Bermuda shorts, Cinemascope, Cinerama, Spartan, Technicolor, Western, aback, abbreviate, abbreviated, abridged, abrupt, abruptly, adulterated, aggressive, all in all, amount, amplify, animated cartoon, apart from …
25Protective relay — See also: Power system protection In electrical engineering, a protective relay is a complex electromechanical apparatus, often with more than one coil, designed to calculate operating conditions on an electrical circuit and trip circuit breakers …
26Diode — Figure 1: Closeup of a diode, showing the square shaped semiconductor crystal (black object on left) …
27High voltage — The term high voltage characterizes electrical circuits, in which the voltage used is the cause of particular safety concerns and insulation requirements. High voltage is used in electrical power distribution, in cathode ray tubes, to generate X… …
28photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
29Magnetosphere — A magnetosphere is formed when a stream of charged particles, such as the solar wind, interacts with and is deflected by the intrinsic magnetic field of a planet or similar body. Earth is surrounded by a magnetosphere, as are the other planets… …
30Burglar alarm control panel — A burglar alarm control panel is a wall mounted unit where the detection devices and wiring of the alarm are ultimately connected and managed. These include devices such as bells, sirens, door contacts, motion detectors, etc. Typical panels are… …
