Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

electric vector potential
a vector function that is used to derive solutions for electric and magnetic fields.
electric vehicle
a vehicle powered by an electrical energy storage device such as batteries.
electrical degrees
a convenient way of representing the distance around the circumference of a machine with two poles spanning the entire 360O of the circumference,

Electrical Degree = Pairs of poles x-intercept Mechanical Degree
electrical network
a collection of interconnected electrical devices.
electrical tree
a microscopic cracking pattern which forms in the insulation of electric power cables which are not exposed to water See tree, water tree.
a general term for optical emission resulting from the passage of electric current.
current-conducting solution between two electrodes or plates of a capacitor, at least one of which is covered by a dielectric.
electrolytic capacitor
a capacitor solution between two electrodes or plates of a capacitor, at least one of which is covered by a dielectric.
a magnet that employs an electric current in a coil to produce a magnetic field.
electromagnetic compatibility (EMC)
the ability of a system or equipment to operate within design tolerances in its intended environment, with adjacent systems and equipment, and with itself, so that the effect of any electromagnetic disturbances produced by the systems or equipment is reduced.
electromagnetic energy
energy contained in electromagnetic fields and associated polarizable and magnetizable media.
electromagnetic environmental effects
encompasses all electromagnetic disciplines, including electromagnetic compatibility (EMC); electromagnetic interference (EMI); electromagnetic vulnerability (EMV); electromagnetic pulse (EMP); radiation hazard (RADHAZ) (hazard of electromagnetic radiation to personnel, ordnance, and fuels (HERP, HERO, HERF)); lightning, p-static; electrostatic discharge (ESD), and emission control (EMCON).
electromagnetic interference (EMI)
(1) any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronics/electrical equipment. It can be induced intentionally, as in some forms of electronic warfare, or unintentionally, as a result of a spurious emissions and responses, intermodulation products, and the like. Additionally, EMI may be caused by atmospheric phenomena, such as lightning and precipitation static and non-telecommunication equipment, such as vehicles and industry machinery.

(2) unwanted high-frequency electrical signals, also known as radio frequency interference (RFI), which can be generated by
power electronic circuits switching at high frequencies. The signals can be transmitted by conduction along cables (450 kHz to 30 MHz) or by radiation (30 MHz to 40 GHz) and can interfere with control or other electronic equipment.
electromagnetic interference filter
a filter used to reduce or eliminate the electromagnetic interference (EMI) generated by the harmonic current injected back onto the input power bus by switching circuits. The harmonic current is caused by the switch action that generates switch frequency ripple, voltage and current spikes, and high-frequency ringing. Generally called an EMI filter.
electromagnetic pulse (EMP)
a large impulsive-type electromagnetic wave generated by nuclear or chemical explosions.
electromagnetic radiation
an electromagnetic wave created by the acceleration or deceleration of charge.
electromagnetic smart materials
materials such as shielding materials, radar-absorbing materials (RAMs), and electromagnetic surface materials, in all of which some electromagnetic properties can be adaptively controlled by means of an external stimulus dictated by the sensed electromagnetic response.
electromagnetic spectrum
the frequency and wavelength of electromagnetic radiation. We have the following classification reported in the figure, while the microwave frequency band designations is reported in the table.
electromagnetic susceptibility
a device's failure to perform appropriately if there is an electromagnetic disturbance.
electromagnetic torque
the torque produced in a machine by the interaction of the magnetic fields and/or by the varying reluctance principle where the field attempts to maximize its intensity in a machine during electromechanical energy conversion.