electro-, electr-, electri-

(Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity)

Electronics in our lives consists of numerous tools

Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.

electromagnetic deflection
1. The use of a magnetic field or external horizontal-deflection and vertical-deflection coils to deflect an electron beam in a television picture tube or an oscilloscope.
2. Deflection of an electron stream by means of a magnetic field.

In a television picture tube, the magnetic fields for horizontal and vertical deflection of the electron beam are produced by sending sawtooth currents through coils in a deflection yoke which goes around the neck of the picture tube.

electromagnetic delay line
1. A delay line the operation of which is based on the time of propagation of electromagnetic waves through distributed or lumped (concentrated) capacitance and inductance.
2. A delay line consisting simply of a transmission line carrying pulse trains.

The delay time generally available is not sufficient for storing a large number of pulses within a reasonable line length.

electromagnetic disturbance
1. A random or periodic electromagnetic occurrence that is superimposed on a desired signal.
2. An electromagnetic development, usually impulsive, that is superimposed on a desired signal.

The disturbance may be random or periodic.

electromagnetic energy
Forms of radiant energy associated with radio waves, heat waves, light waves, gamma rays, cosmic rays, X-rays, and other types of electromagnetic radiation.
electromagnetic environment, EME
1. The radio-frequency field or fields existing in a given area or desired in an area to be shielded.
2. The resulting product of the power and time distribution, in various frequency ranges, of the radiated or conducted electromagnetic emission levels that may be encountered by a military force, system, or platform when performing its assigned mission in its intended operational environment.

It is the sum of electromagnetic interference; electromagnetic pulse; hazards of electromagnetic radiation to personnel, ordnance, and volatile materials; and the natural phenomena effects of lightning and precipitation static.

electromagnetic field tensor
An antisymmetric second-rank tensor whose elements are proportional to the electric and magnetic fields.
electromagnetic field, EMF; electric-magnetic field
1. All forms of energy emanating from an electrical source and transmitted through the air.

Included are the fields produced by light, radio, X-rays, and gamma rays and the higher the frequency of the fields produced, the more energy is contained.

2. The combination of electric and magnetic fields that surround moving electrical charges (for example, electrons); such as, those in electric currents.

Electromagnetic fields apply a force on other charges and can induce current flows in nearby conductors.

3. An oscillating electric field and its associated magnetic field acting at right angles to each other and at right angles to their direction of motion.
4. The region surrounding a moving electric charge which consists of magnetic and electric force fields especially related; such as, to orientation and strength, and that possesses a definite amount of energy.
5. A field created by the interplay of an electric field and a magnetic field when an electric current passes through a wire.

An electromagnetic field consists of two kinds of energy: electrostatic (potential energy) and electrodynamic (kinetic energy).

electromagnetic flowmeter, electromagnetic meter
1. An instrument that measures the rate of flow (movement of electric charges, gases, liquids), without interruption of the flow, by producing an electromagnetic field in a liquid that creates an interior current, proportional to the actual flow rate, which is detected by two electrodes.
2. A flowmeter that offers no obstruction to liquid flow.

Two coils produce an electromagnetic field in the conductive moving fluid.

The current induced in the liquid, detected by two electrodes, is directly proportional to the rate of flow.

3. A flowmeter in which changes in the flow of blood are measured through impedance to electromagnetic lines of force that are introduced across a stream of blood.

It has the great advantage that an intact blood vessel can be used.

electromagnetic focusing (s) (noun), electromagnetic focusings (pl)
A method of adjusting the electron beam in a television picture tube by varying the direct current flowing through the coils attached to the tube, and so, altering or changing the surrounding magnetic field: The electromagnetic focusing field is produced by sending an adjustable value of direct currents through a focusing coil mounted on the neck of the tube.
electromagnetic force
A form of energy which produces all the interactions between charged particles; such as, electricity, magnetism, chemical reactions, etc.

Electromagnetic force stops solids from falling apart, and acts between all particles with electric charges.

The elementary particle which is the carrier for the electromagnetic force is the photon.

electromagnetic horn
A horn-shaped antenna structure which provides highly directional radiation of radio waves in the 100 megahertz or higher frequency range.

Signal power is fed to the horn by a waveguide or an exciting dipole or loop at the input end of the horn.

electromagnetic hypersensitivity (s), EHS; electromagnetic hypersensitivities (pl) (nouns)
Adverse medical symptoms said to be caused by exposure to a physical field produced by moving electrically charged objects or physical properties of matter that causes it to experience a force when near other electrically charged material: "Research has indicated that those who suffer from electromagnetic hypersensitivity have symptoms that are caused by obscure or unknown sources including environmental intolerance attributed to electromagnetic fields (IEI-EMF) or electromagnetic hypersensitivity (EHS), which is also referred to as electrohypersensitivity, electrosensitivity, and electrical sensitivity."

"Those who claim to suffer from electromagnetic hypersensitivity report having headaches, fatigue, stress, sleep disturbances, skin symptoms like being stuck with needles, burning sensations and rashes, pains and aches in the muscles, and other health problems."

electromagnetic induction
1. Generation of an electromotive force, in an insulated conductor moving in an electromagnetic field, or in a fixed conductor in a moving magnetic field.
2. The production of electric current in a circuit when it is passed through a changing magnetic field.
3. Voltage produced in a coil as a result of the relative motion between the coil and magnetic lines of force; such as, flux linkages passing through the coil changes.
4. The production of an electromotive force in a circuit by the variation of the magnetic field with which the circuit is connected.
5. The generation of an electromotive force by changing the magnetic flux through a closed loop circuit, or by moving a conductor across the magnetic field.

This principle is the basis for the electric generator and electric motor.

electromagnetic inertia
1. The characteristic delay of a current response in an electric circuit as it reaches its maximum or zero value after the source voltage is applied or removed.
2. Characteristic delay of a current in an electric circuit in reaching its maximum value, or in returning to zero, after the source voltage has been removed or applied.
electromagnetic interaction
1. A long-range force involving the electric and magnetic properties of elementary particles.
2. The interaction caused by elementary particles that results from the coupling of charge to the electromagnetic field.
3. The interaction due to electric charge; this includes magnetic effects that have to do with moving electric charges.
4. An interaction between charged elementary particles which is intermediate in strength between the strong and weak interactions.

The references or sources of information for compiling the words and definitions in this unit are listed at this Electronic Bibliography page or specific sources are indicated when they are appropriate.

A cross reference of word units that are related, directly and/or indirectly, with "electricity": galvano-; hodo-; ion-; piezo-; -tron; volt; biomechatronics, info; mechatronics, info.