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81Diving cylinder — Diving cylinders to be filled at a diving air compressor station …
82Cave diving — is a type of technical diving in which specialized SCUBA equipment is used to enable the exploration of natural or artificial caves which are at least partially filled with water. It is an extension of the more common sport of caving, but is much …
83Scuba diving — Not to be confused with Self contained breathing apparatus, which describes breathing sets used out of water. Scuba diver Scuba diving ( SCUBA originally being an acronym for self contained underwater breathing apparatus, now widely considered a… …
84RS-232 — This article is about the RS 232 standard. For RS 232 variants, see serial port. A 25 pin connector as described in the RS 232 standard In telecommunications, RS 232 (Recommended Standard 232) is the traditional name for a series of standards for …
85Fuse (electrical) — A miniature time delay fuse used to protect electronic equipment, rated 0.3 amperes at 250 volts. 1.25 inches (about 32 mm) long …
86Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… …
87Panel switch — The panel switching system was an early type of automatic telephone exchange, first put into urban service by the Bell System in the 1920s and removed during the 1970s. The Panel and Rotary systems were developed in parallel by Bell Labs before… …
88Battery (electricity) — For other uses, see Battery (disambiguation). Various cells and batteries (top left to bottom right): two AA, one D, one handheld ham radio battery, two 9 volt (PP3), two AAA, one C, one …
89Scattering parameters — or S parameters are properties used in electrical engineering, electronics engineering, and communication systems engineering describing the electrical behavior of linear electrical networks when undergoing various steady state stimuli by small… …
90Diode modelling — In electronics, diode modelling refers to the mathematical models used to approximate the actual behavior of real diodes to enable calculations and circuit analysis. A diode s I V curve is nonlinear (it is well described by the Shockley diode… …
