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Inverter (electrical) print that page


An inverter is an electrical device that converts direct current (DC) to alternating current (AC) [ 1 ] ; the converted AC can be at any required voltage and frequency with the use of appropriate transformers , switching, and control circuits. Solid-state inverters have no moving parts

Electrical connector print that page


An electrical connector is an electro-mechanical device for joining electrical circuits as an interface using a mechanical assembly. The connection may be temporary, as for portable equipment, require a tool for assembly and removal, or serve as a permanent electrical joint between two

Bionic contact lens print that page


The bionic contact lens are being developed to provide a virtual display that could have a variety of uses from assisting the visually impaired to the video game industry. [ 1 ] The device will have the form of a conventional contact lens with added bionics technology. [ 2 ] The lens

Electrical tester pen print that page


An electrical tester pen , test pen , or voltage detector 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 wire in a switch or inserted

Electrical phenomena print that page

EHD) or sometimes electro-fluid-dynamics, a counterpart to the well-known magneto-hydrodynamics. Contact electrification — The phenomenon of electrification by contact . When two objects were touched together, sometimes the objects became spontaneously charged (οne negative charge, one | 2011/3/6 20:24:22

Ground (electricity) print that page


In electrical engineering , ground or earth may be the reference point in an electrical circuit from which other voltages are measured, or a common return path for electric current , or a direct physical connection to the Earth . A typical earthing electrode (left) at a home in Australia

Switch print that page


In electronics , a switch is an electrical component that can break an electrical circuit , interrupting the current or diverting it from one conductor to another. [ 1 ] [ 2 ] The most familiar form of switch is a manually operated electromechanical device with one or more sets of electrical

AC power plugs and sockets print that page


example, and some systems are designed such that dangerous voltage is never present on an exposed contact . Exposed contacts are present in some sockets, but are used exclusively for grounding (earthing) . Contents 1 Terminology 2 Two vs. three contacts 2.1 Polarization 3

Third rail print that page


insulated brackets, typically at intervals of 10 feet (3.0 metres) or so. The trains have metal contact blocks called "shoes" which make contact with the conductor rail. The traction current is returned to the generating station through the running rails. The conductor rail is usually made

Relay print that page


Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating