Electrical engineering

A distribution board (also known as panelboard, breaker panel, or electric panel) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits, while providing a protective fuse or circuit breaker for each circuit in a common enclosure.

A dynamo is an electrical generator that produces direct current with the use of a commutator.

A wire is a single, usually cylindrical, flexible strand or rod of metal.

("Wiring" redirects here. For the software development platform, see Wiring (development platform).)(This article is about building wiring. For power distribution, see Electric power transmission and Electric power distribution.) Building wiring is the electrical wiring and associated devices such as switches, meters and light fittings used in buildings or other structures.

A residual-current device (RCD), or residual-current circuit breaker (RCCB), is a device that instantly breaks an electric circuit to prevent serious harm from an ongoing electric shock.

The IP Code, International Protection Marking, IEC standard 60529, sometimes interpreted as Ingress Protection Marking, classifies and rates the degree of protection provided against intrusion (body parts such as hands and fingers), dust, accidental contact, and water by mechanical casings and electrical enclosures.

A chiclet keyboard, or island-style keyboard, is a type of input device for electronic systems such as personal computers, calculators and remote controls that uses keys in the shape of small squares with rounded corners and straight sides, in the style of Chiclets, an American chewing gum brand.

Mesh analysis (or the mesh current method) is a method that is used to solve planar circuits for the currents (and indirectly the voltages) at any place in the circuit.

Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction.

Direct current (DC) is the unidirectional flow of electric charge.

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit.

An electric motor is an electrical machine that converts electrical energy into mechanical energy.

An electrical network is an interconnection of electrical components (e.g. batteries, resistors, inductors, capacitors, switches) or a model of such an interconnection, consisting of electrical elements (e.g. voltage sources, current sources, resistances, inductances, capacitances).

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

A printed circuit board (PCB) mechanically supports and electrically connects electronic components using conductive tracks, pads and other features etched from copper sheets laminated onto a non-conductive substrate.

The Smith chart, invented by Phillip H.

Solid-state electronics are those circuits or devices built entirely from solid materials and in which the electrons, or other charge carriers, are confined entirely within the solid material.

In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

A bimetallic strip is used to convert a temperature change into mechanical displacement.

A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm.

AC power plugs and sockets are devices that allow electrically operated equipment to be connected to the primary alternating current (AC) power supply in a building.

Diesel-electric transmission, or diesel-electric powertrain is used by a number of vehicle and ship types for providing locomotion.

Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.

A Faraday cage or Faraday shield is an enclosure used to block electric fields.

A thermocouple is an electrical device consisting of two different conductors forming electrical junctions at differing temperatures.

Three-phase electric power is a common method of alternating-current electric power generation, transmission, and distribution.

A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.

A temperature coefficient describes the relative change of a physical property that is associated with a given change in temperature.

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies.

The magnetic amplifier (colloquially known as a "mag amp") is an electromagnetic device for amplifying electrical signals.

Operational calculus, also known as operational analysis, is a technique by which problems in analysis, in particular differential equations, are transformed into algebraic problems, usually the problem of solving a polynomial equation.

In building wiring, a light switch is a switch, most commonly used to operate electric lights, permanently connected equipment, or electrical outlets.

The following outline is provided as an overview of and topical guide to electrical engineering.

In electrical and electronic engineering a daisy chain is a wiring scheme in which multiple devices are wired together in sequence or in a ring.

A high-voltage cable (HV cable) is a cable used for electric power transmission at high voltage.

In control engineering, a single-input and single-output (SISO) system is a simple single variable control system with one input and one output.

Street light interference (SLI) is a term coined by paranormal author Hilary Evans to denote the claimed ability of individuals to turn street lights or outside building security lights on or off when passing near them.

The term high voltage usually means electrical energy at voltages high enough to inflict harm on living organisms.

An induction heater is a key piece of equipment used in all forms of induction heating.

Adjustable speed drive (ASD) or variable-speed drive (VSD) describes equipment used to control the speed of machinery.

From 1929 to the late 1960s, large alternating current power systems were modelled and studied on AC network analyzers (also called alternating current network calculators or AC calculating boards) or transient network analyzers.

A network analyzer is an instrument that measures the network parameters of electrical networks.

For transmission lines, the space between overhead line and ground forms a capacitor parallel to transmission line, which causes an increase in voltage as the distance increases.

The efficiency of an entity (a device, component, or system) in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed (a fractional expression), typically denoted by the Greek letter small Eta (η - ήτα).