Electrical conductivity — or specific conductivity is a measure of a material s ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity σ… … Wikipedia
Electrical resistivity and conductivity — This article is about electrical conductivity in general. For the specific conductance of aqueous solutions, see Conductivity (electrolytic). For other types of conductivity, see Conductivity. Electrical resistivity (also known as resistivity,… … Wikipedia
Electrical telegraph — A printing electrical telegraph receiver, and a transmitter key at bottom right An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via telecommunication lines or radio. The electromagnetic telegraph is a device… … Wikipedia
Indicator telegraph — Telegraph Tel e*graph, n. [Gr. ? far, far off (cf. Lith. toli) + graph: cf. F. t[ e]l[ e]graphe. See {Graphic}.] An apparatus, or a process, for communicating intelligence rapidly between distant points, especially by means of preconcerted… … The Collaborative International Dictionary of English
Electrical tester pen — An electrical tester pen or test pen is a device for quickly checking whether a conductor is live. The device may have the form of a screwdriver. The tip of the device is touched to the conductor being tested (for instance, it can be used on a… … Wikipedia
electrical system — noun 1. utility that provides electricity • Syn: ↑electrical plant • Hypernyms: ↑utility 2. equipment in a motor vehicle that provides electricity to start the engine and ignite the fuel and operate the lights and windshield wiper and heater and… … Useful english dictionary
Fault indicator — A fault indicator is a device which provides visual indication of an electrical fault. They are used in electric power distribution networks as a means of automatically detecting and identifying faults. Basic principles During an electrical fault … Wikipedia
Lamp (electrical component) — A lamp is a replaceable component such as an incandescent light bulb, which is designed to produce light from electricity. These components usually have a base of ceramic, metal, glass or plastic, which makes an electrical connection in the… … Wikipedia
Fuse (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 … Wikipedia
Crash Position Indicator — The Crash Position Indicator (CPI) is a radio beacon designed to be ejected from an aircraft when it crashes. This helps ensure it survives the crash and any post crash fires or sinking, allowing it to broadcast a homing signal to search and… … Wikipedia
turn indicator — noun a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn • Syn: ↑blinker, ↑turn signal, ↑trafficator • Derivationally related forms: ↑blink (for: ↑blinker) … Useful english dictionary