Electrical engineering is now divided into a wide range of fields, including computer engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, and electronics. Many of these disciplines overlap with other engineering branches, spanning a huge number of specializations including hardware engineering, power electronics, electromagnetics and waves, microwave engineering, nanotechnology, electrochemistry, renewable energies, mechatronics, and electrical materials science. See glossary of electrical and electronics engineering.

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Alternating Current Machines Alternating-Current Machine. an electrical machine that functions as (1) a generator used to produce alternating current, or (2) a motor that converts electrical energy into mechanical work, or (3) a converter that changes the voltage or frequency of an electric current.
Capacitance is the ratio of the change in electric charge of a system to the corresponding change in its electric potential. There are two closely related notions of capacitance: self capacitance and mutual capacitance. Any object that can be electrically charged exhibits self capacitance. Wikipedia SI unit: farad Other units: μF, nF, pF In SI base units: F = A2 s4 kg−1 m−2 Derivations from other quantities: C = charge / voltage Dimension: M−1 L−2 T4 I2 Formula q = CV q = charge C = capacitance V = voltage
Direct current (DC) is an electric current that is uni-directional, so the flow of charge is always in the same direction.
Domestic electrical installations. Domestic electrical installations are within the scope of the Building Regulations. ... It is also hoped to reduce injuries arising from fires in dwellings due to electrical components overheating or arcing.
lighting circuit - wiring that provides power to electric lights light circuit wiring - a circuit of wires for the distribution of electricity
A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another, or multiple circuits. A varying current in any one coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force across any other coils wound around the same core. Electrical energy can be transferred between separate coils without a metallic (conductive) connection between the two circuits. Faraday's law of induction, discovered in 1831, describes the induced voltage effect in any coil due to a changing magnetic flux encircled by the coil. Transformers are most commonly used for increasing low AC voltages at high current (a step-up transformer) or decreasing high AC voltages at low current (a step-down transformer) in electric power applications, and for coupling the stages of signal processing circuits. Transformers can also be used for isolation, where the voltage in equals the voltage out, with separate coils not electrically bonded to one another.
It’s vitally important to take safety precautions when working with electricity. Safety must not be compromised and some ground rules need to be followed first. The basic guidelines regarding the safe handling of electricity documented below will help you while working with electricity.
Cell and battery In order to provide a potential difference, or electro-motive force (EMF) a store of energy is required. One such method is a battery or cell. ... If it is just a single chemical source then it is called a cell.

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