2. Charged with electricity; such as, an electric battery.
3. Containing, producing, arising from, or actuated by electricity, or designed to carry electricity and capable of doing it.
Examples are electric energy, electric lamp, electric eel, electric vehicle, and electric motor.4. Carrying electricity, or designed to carry electricity.
5. Run by electricity; for example a musical instrument like an electric guitar, producing sounds electronically through a speaker.
Electric, in many cases is used interchangeably with electrical, and it is often restricted to the description of particular devices or to concepts relating to the flow of electric current; such as, an electric fire or an electric charge.
An atmospheric electric field is a quantitative term indicating the electric field strength of the atmosphere at any specified point in space and time.
An atmospheric electric field is also a measure, in volts per meter, of the electrical energy in a given portion of the Earth's atmosphere at a given time.
The existence of an electric field is made known by its effect on another electric charge, and the existence of a magnetic field can be made known by its effect on another magnet.
A field around a magnet or an electric current will deflect a small magnet; such as, a compass needle, in a particular direction when it is placed in such a field.
The direction in which the north pole of the magnet points is normally called the direction of the field and the direction of the field generally follows curved lines of force.
2. A luminous discharge of current that is formed when a strong current jumps a gap in a circuit or between two electrodes.
Electric arcs across specially designed electrodes can produce very high heat and bright light, and are used for such purposes as welding and illumination in spotlights.
Unwanted arcs in electrical circuits can cause fires and lightning is an example of an electric arc between one cloud and the earth or another cloud, as are sparks caused by discharges of static electricity.
2. A furnace used to heat materials with the energy from an electric arc.
3. An electric furnace in which an electric arc provides the source of heat for making steel.
4. A steel-making apparatus which uses high-quality scrap or ore with the polluting elements eliminated.
2. The heating of matter by an electric arc.
The material may be solid, liquid, or gaseous and when the heating is direct, the material to be heated is one electrode; but for indirect heating, the heat is transferred from the arc by conduction, convection, or radiation.
2. A general term for a class of lamps which produce light by an electric arc or a voltaic arc.
The lamp consists of two electrodes, typically made of tungsten, that are separated by a gas.
2. Two or more primary cells connected together, usually in a series, to provide a source of electric current.
3. A direct-current voltage source made up of one or more units that convert chemical, thermal, nuclear, or solar energy into electrical energy.
The electric blood warmer includes a container with an electric heater and space for the insertion of a disposable blood-warming bag composed of parallel plastic tubes.
2. A steam generator using electric energy, in immersion, resistor, or electrode elements, as a source of heat.
3. A tank in which water is heated, or hot water is stored, and which is controlled by an electric current.
2. An emergency braking system which is automatically applied to an electric-powered apparatus when a power failure occurs.
3. An electric brake design in which the electromagnet is a small disc (spot) attached to an actuating lever is supplied by current flowing through a solenoid, or through an electromagnet which is attracted to disks on the rotating member, actuating the brake shoes.
This force is counteracted by the force of a compression spring.4. The contact component of an electric braking system.
2. The process of applying any type of electric brake.
2. A brush discharge like that which is used in therapeutics.
2. An automobile powered by a motor supplied with electric current from a storage battery or other device; such as, a fuel cell.
Electric cars were popular between the late 1890's and 1910 and interest in them has revived with new methods of generating electrical power.
2. The application of a needle or snare heated by electric current for the destruction of bodily tissue; such as, for removing warts or polyps and cauterizing small blood vessels to limit blood loss during a surgical procedure.
2. A single unit of a device that converts radiant energy into electric energy, such as a nuclear, solar, or photovoltaic cell.
3. A device; such as, a battery, that is capable of changing some form of energy including chemical energy or radiant energy, into electricity.
4. A container holding materials that produce electricity by chemical action.
A battery consists of one or more electric cells.
An electron has a negative charge, and a proton has a positive charge.2. The amount of electricity accumulated in a body by the gain or loss of electrons.
3. An accumulation of electricity in a storage battery, capacitor, etc., which may be discharged.
4. The quantity of electricity that flows in electric currents or which accumulates on the surfaces of dissimilar nonmetallic substances that are rubbed together briskly.
A charge can be positive or negative and one positive charge can combine with one negative charge, and the result is a net charge of zero.
Two objects that have an excess of the same type of charge repel each other, while two objects with an excess of opposite charges attract each other.
2. A fundamental property of matter in which it exhibits two states, positive and negative, that result in the action of electric forces in the presence of an electric field.
3. A chopper apparatus that uses an electromagnet driven by an AC source to vibrate a reed which periodically interrupts an electrical contact.
A chopper is a device for interrupting an electric current, a beam of light, or a beam of infrared radiation at regular intervals, to permit amplification of the associated electrical quantity or signal by an alternating-current amplifier. It is also used to interrupt a continuous stream of neutrons to measure velocity.
Electric lights, televisions, radios, and other electrical instruments function because of an electric circuit that starts at a power plant which generates electricity and ends up where people have outlets that allow the electric current to perform.2. The path of the electron flow from a generating source through various components and back to the generating source.
3. A closed path that conveys an electric current through a conducting material which can be made of ionized gases or ionized liquids, but metals are most commonly used.
The most simple electric circuit consists of a source of electricity; such as, a battery and a conducting material as a wire
Current flows from the positive terminal of the battery through the wire to the negative terminal.
A resistor; such as, a light bulb can be added to the circuit, as can a switch that can be used to open the wire. Current flowing through the wire will light the bulb unless the switch is used to cut the circuit off.
2. A clock in which the first wheel of the going train is the rotor of a synchronous electric motor whose speed is entirely controlled by the frequency of the alternating current.
3. Any clock that is operated by electric power; specifically, a clock driven by an alternating-current motor whose current has a definite frequency, controlled at the generator.
4. A clock that is powered by electricity instead of powered manually (winding) or by other sources of energy; specifically, in order to wind the mainspring or to drive the pendulum or oscillator.
In high-frequency circuits, a coil may be only a fraction of a turn.
2. A comparator in which movement results in a change in some electrical quantity that is then amplified by electrical means.
A comparator is a device used to inspect a gaged part (thickness of a metal sheet, a rod, or a wire) for deviation from a specified dimension, by mechanical, electrical, pneumatic, or optical procedures.
Electrical conductors are used to conduct electric current, as in the metal wires of an electric circuit.
Electrical conductors are usually metallic while thermal conductors allow thermal energy to flow because they do not absorb radiant heat and they include materials; such as, metal and glass.
2. A metal strip in a switch or socket that touches a corresponding strip in order to make a connection for electric current to pass: "Some electric contacts are made of precious metals in order to avoid corrosion."
2. The control of a machine by electric switches, relays, rheostats, or a resistor designed to allow variation in resistance without breaking the electrical circuit of which it is a part.
3. The control of a machine or instrument by switches, relays, or rheostats, as contrasted with electronic control by electron tubes or by devices which do the work of electron tubes.
2. An instrument which regulates the electric power that is delivered to a piece of machinery, a tool, or a device which is used for a specific purpose.
2. A synchronous device used to convert alternating current (AC) to direct current (DC), or the reverse: The AC-to-DC converter, provided by the synchronous converter, has been replaced by a mercury arc rectifier (for reasons of efficiency, lower maintenance costs, and fewer problems) or by motor-generator sets.
2. A rotating machine whose torque is transmitted or controlled by electric or magnetic processes.
2. A device which is used to measure the magnitude of an electric current of several amperes or more.
An ammeter is usually combined with a voltmeter and an ohmmeter in a multipurpose tool.
2. Charged particles, most often electrons, moving through a conductor or transmitter; such as, copper and aluminum.
3. A flow of charged particles; such as, electrons or protons, accompanied by the field which they generate.
4. Movement of electric charge carriers.
In a wire, electric current is a flow of electrons that have been dislodged from atoms and is a measure of the quantity of electrical charge passing any point of the wire per unit of time.
2. An electrical instrument which is used to interrupt the flow of current through any special apparatus or instrument, either automatically or manually.
2. A delay line that uses properties of lumped or distributed capacitive and inductive elements.
It can be used for signal storage by recirculating information-carrying wave patterns.
2. A process used to remove impurities; such as, inorganic salts from crude oil by settling them out (gravity separation of heavy from light materials) in an electrostatic field.
2. A detonator ignited by a fuse wire which serves to touch off the primer.
2. A pair of equal and opposite electric charges, the centers of which do not coincide.
3. Any object or system which is oppositely charged at two points, or poles; such as, a magnet or a polar molecule.
4. A pair of equal and opposite charges an infinitesimal distance apart from each other.
2. A lamp in which light is produced by an electric discharge between electrodes in a gas (or vapor) at low or high pressure.
3. A lamp that uses the transmission of an electric current through a gas or vapor to produce illumination. Neon, mercury and argon lamps are examples of electric-discharge lamps.
4. A lamp whose light is produced by current flow through a gas or vapor in a sealed glass enclosure.
Examples of these lamps include argon glow, mercury-vapor, neon glow, and sodium-vapor.
2. The flow of electricity through a gas, resulting in the emission of radiation that is characteristic of the gas and of the intensity of the current.
3. The removal of a charge from a battery, capacitor, or other electric-energy storage device.
4. The passage of electricity through a gas, usually accompanied by a glow, arc, spark, or corona.
It is primarily used where precise control is not required; such as, for removing broken drills and taps.
It is made up of ions of one charge type which are fixed to the surface of the solid and an equal number of mobile ions of the opposite charge which are distributed through the neighboring region of the liquid.2. The area of a charge separation formed when an electrode meets an ionic conductor.
A metal electrode in a water solution forms a specific structure consisting of the metal surface itself, an adjoining layer of adsorbed (adhesion to the surfaces of solids) water molecules and ions, and an outer region of oppositely charged ions diffused in the liquid.
This causes an electric field of considerable intensity.3. An interfacial region, near the boundary between two different phases of a substance, in which physical properties change significantly.
4. A structure that appears on the surface of a charged object when it is placed into a liquid.
This object might be a solid particle, a gas bubble, a liquid droplet, or a porous body.
This includes a magnet or a polar molecule; more precisely, it is the limit as either charge goes to infinity, the separation distance to zero, while the product remains constant.
2. A mechanism that transmits motion from one shaft to another and controls the velocity ratio of the shafts by electrical means.
3. An automatic transmission in which a generator, connected with the engine, supplies power to a separate electric motor or motors; which drive the wheels.
It is used in buses, trucks, and Diesel locomotives.
Found in South American Amazon and Orinoco rivers and tributaries. They produce powerful electric shocks to stun prey, or for defense, sufficient to immobilize a large mammal.
2. The energy constituent in a circuit because of its position in relation to a magnetic field.
3. The energy of electric charges or currents because of their positions in an electric field.
4. The integral with respect to time of the instantaneous power input or power output of a circuit or appliance.
The basic unit is the watthour.
2. A rocket engine in which the propellant is accelerated by some electric device.
2. A fence consisting of one or more lengths of wire energized with high-voltage, low-current pulses, and giving a warning shock when touched.
3. A wire fence carrying an electric current which gives a mild electric shock to any human or animal that touches it.
2. A region in space in which a stationary electric charge experiences a force due to its charge.
3. The area around an electrically charged body in which other charged bodies are acted on by an attracting or repelling force.
4. The lines of force exerted on charged ions in the bodily tissues by the electrodes that cause charged particles to move from one pole to another pole.
5. One of the fundamental fields in nature, causing a charged body to be attracted to or repelled by other charged bodies.
Associated with an electromagnetic wave or a changing magnetic field.
The electric field is stronger where the field lines are close together than where they are farther apart.
The value of the electric field has dimensions of force per unit charge and is measured in units of newtons per coulomb.
2. The effect of an electric field on spectrum lines.
The electric field may be externally applied; but in many cases it is an internal field caused by the presence of neighboring ions or atoms in a gas, liquid, or solid.
2. A network that transmits alternating currents of desired frequencies while substantially attenuating all other frequencies.
One side of the line is connected by an insulated wire to the primer, and the other side is grounded to the frame of the weapon.
2. The procedure used when applying electric energy to a semiconductor or other device to permanently modify its electrical characteristics.
2. Any furnace which by using the heating effect of an electric current, allows very high temperatures to be achieved.
A fuse commonly consists of a current-conducting strip or wire of easily fusible metal; whenever the circuit is made to carry a current larger than that for which it is intended, the strip melts to interrupt it.
In its most common form, a large number of conductors are mounted on an armature which is rotated in a magnetic field produced by field coils.2. A vacuum-tube oscillator or any other non-rotating device that generates an alternating voltage at a desired frequency when energized with direct-current power or low-frequency alternating-current power.
3. A circuit that generates a desired repetitive or non-repetitive waveform; such as, a pulse generator.
2. A guitar in which a contact microphone placed under the strings picks up the acoustic vibrations for amplification and for reproduction by a loudspeaker.
Volume and tone controls are usually also available.
2. A tool for indicating by electrical means the humidity of the ambient atmosphere.
It is usually based on the relation between the electric conductance of a film of hygroscopic material and its moisture content.
It is similar to magnetic hysteresis in ferromagnetic materials.
Hysteresis is the lag between making a change; such as, increasing or decreasing electric power, and the response or effect of that change.
It usually refers to turn-on and turn-off points in electrical, electronic, and mechanical systems.
2. Ignition of a charge of fuel vapor and air in an internal-combustion engine by passing a high-voltage electric current between two electrodes in a combustion chamber.
2. An electric charge measured from an arbitrary reference line which is used in finding the electric field set up by fixed electric charges in the area of a conductor.
The electric conductor, with its distribution of induced surface charges, is replaced by one or more of these fictitious charges.
The electric field is the set of all values of the electric field strength, but electric field and electric field intensity (as well as electric field strength and electric vector) are used more or less interchangeably.
The trend is to use an electric field both for the field taken as a whole and for its value at any point with a context being sufficient to determine the precise meaning.
A baker consists of two or more electric lamps mounted in semicircular containers used for applying heat to various parts of the body.
2. Any form of lighting produced by an electric current in any one of several devices; for example, a fluorescent lamp, an arc lamp, an incandescent lamp, etc.
2. The electric lines of force that make up an electric field or region.
3. The integral over a surface of the component of the electric displacement perpendicular to the surface and equal to the number of electric lines of forces crossing the surface.
2. A locomotive operated by electric power picked up from a system of continuous overhead wires, or, sometimes, from a third rail mounted alongside the track.
A borehole is a deep hole drilled into the ground to obtain samples for geologic study or to release or extract water or oil.
2. A device that measures electric power consumed, either at an instant, as in a wattmeter, or averaged over a time interval, as in a demand meter.
A demand meter is any of several types of instruments used to determine a customer's maximum demand for electric power over a time interval; generally it is used for billing industrial users.
2. One of a series of quantities characterizing an electric charge distribution.
2. A distribution of an electric charge which is concentrated at a point or is spherically symmetric.
2. An instrument that converts electrical power into mechanical torque or the force generated by an internal-combustion engine to turn a vehicle's drive shaft.
2. The electric and magnetic fields generated by a static or oscillating electric multipole.
Sources include electric appliances, electric motors, engine ignition, and power lines.
This condition comes from undue exposure to such bright lights as the electric arc used in welding and the arc lights used in motion-picture studios.
2. An organ consisting of rows of electroplaques which produce an electric discharge.
Such physical organs are found in electric eels, electric rays, and the African catfish.
2. A power line termination from which electric power can be obtained by inserting the plug of a line cord.
2. A "male" electric plug in for inserting electrical contact prongs in order to connect mechanically and electrically into slots of a matching "female" electric socket.
2. The separation of charges in a material to form electric dipoles, or the alignment of existing electric dipoles in a material when an electric field is applied.
A dipole is a localized positive and negative charge distribution that has no net charge, and whose mean positions of positive and negative charges do not correspond.
Similarly, a magnetic potential exists at every point of a magnetic field, measured by the work than is needed to move a unit magnetic pole from one point in the field to another point.2. The potential measured by the energy of a unit positive charge at a point expressed relative to an equipotential surface that has zero potential, generally the surface of the earth.
3. The work which must be done against electric forces to bring a unit charge from a reference point to the point in question.
The reference point is located at an infinite distance, or, for practical purposes, at the surface of the earth or some other large conductor.
In a direct current (DC) circuit, the current measured in amperes, multiplied by the voltage between wires, is the power in watts.
A thousand watts constitute the kilowatt, a larger and more frequently employed unit of electric power.
The voltage and current may not be in phase with each other in an alternating current (AC) circuit and, while the instantaneous power is the product of the instantaneous voltage and current, this out-of-phase relation causes the power to fluctuate between positive and negative values.
By definition, power is the rate at which energy is transformed or is made available and is measured in watthours.
From an economic viewpoint, the most important of all electrical measurements is the measurement of energy. The watthour meter in various forms can be found in nearly every home, factory, highway billboard, and other locations where electrical energy is being purchased.
Metering, installation and wiring have been governed by national, industrial, and local codes for so many years that, at least in the United States, a particular type of installation is nearly identical everywhere in the country.
Measurement of energy is almost always with a "fixed-installation metering". This provides safety because of the grounding of the meter enclosure and ease of reading as a result of a proper location and mounting.
Tamper-proof housing, which are also weatherproof where necessary, are typical structures that normally insure the integrity of the electric meter readings.
Powerline networks do not interfere with the delivery of electricity in the same circuit because the data are transmitted at a much higher frequency than the 60Hz or 50Hz used for AC (alternating current) power.
This "plant" reference is apparently linked to the action of pressing on a shovel, or some other tool, with the "sole of the foot" in order to work the soil for planting.
2. A facility that generates electrical energy using generators.
3. An assembly of equipment in an electric power system through which electric energy is passed for transmission, transformation, distribution, or switching.
2. The circuitry applied to many electrical devices, in which electric energy is generated, transmitted, transformed, and distributed in the form of heat or as a driving force to other motor-controlled systems.
It consists substantially of one or two small collecting electrodes to which various potentials are applied, with the corresponding collection of currents being measured.
2. A general term encompassing all the various types of propulsion in which the propellant consists of electrically charged particles which are accelerated by electric or magnetic fields, or both.
3. Propulsion of spacecraft and other vehicles by electrothermal, electrostatic, or plasma techniques, as contrasted to chemical propulsion, which involves the direct use of fuel.
2. A particular type of equipment used in electric power systems to detect abnormal conditions and to initiate appropriate corrective actions.
2. A charge distribution that produces an electric field equivalent to what is produced by two electric dipoles whose dipole moments have the same magnitude, but point in opposite directions and which are separate from each other by a small distance.
2. An instrument for focusing beams of charged particles which has four electrodes with alternately positive and negative polarity; used in electron microscopes and particle accelerators.
3. An apparatus that uses four electrodes set in an alternating positive-negative polarity series to focus the beams of charged particles employed in electron microscopes and particle accelerators.
2. A process in which an atom produces or absorbs quadrupole radiation when it changes from one energy level to another.
A busbar is a heavy, rigid metallic conductor, usually uninsulated, which is used to carry a large electric current or to make a common connection between several electrical circuits.
2. An electromechanical or solid-state device operated by variations in the input which, in turn, operate or control other devices connected to the output.
They are used in a wide variety of applications throughout industry; such as, in telephone exchanges, digital computers, motor and sequencing controls, and automation systems.
Highly sophisticated relays are utilized to protect electric power systems against trouble and power blackouts; as well as, to regulate and to control the generation and distribution of electrical power.
In private residences, relays are used in refrigerators, automatic washers, dishwashers, and heat and air-conditioning controls.3. An electromechanical switch operated by a flow of electricity in one circuit and controlling the flow of electricity in another circuit.
A relay composed essentially of an electromagnet with a soft iron bar, called an armature, held close to it.
A movable contact is connected to the armature in such a way that the contact is held in its normal position by a spring and when the electromagnet is energized, it exerts a force on the armature that overcomes the pull of the spring and moves the contact so as to either complete or to break a circuit.
A relay is an electrical device such that electric current flowing through it in one circuit can switch on and off a current in a second circuit
2. The opposition to a flow of electric current through a circuit component, medium, or substance.
It is the magnitude of the actual part of the impedance and is measured in ohms.
2. A target-seeking method in which an operator directs the radar beam by varying the phase or amplitude of the currents flowing into various components of its antenna.
2. A traumatic physical state caused by the passage of electric currents through the body.
3. The sudden pain, convulsion, unconsciousness, or death produced by the passage of electric current through a body.
4. Injury from electricity that varies according to the type and strength of current and length and location of the contacts.
It usually involves an accidental contact with exposed parts of electric circuits in home appliances and domestic power supplies; however, it may also result from lightning or contact with high-voltage wires.
Electric shocks range from trivial burns to complete charring and destruction of skin. They may also cause unconsciousness from paralysis of the respiratory center, fibrillation of the heart, or both depending on the intensity of the electric current, the type of current, and the duration and the frequency of the current flow.
Alternating current (AC), direct current (DC), and mixed currents cause different kinds and different degrees of damage to the body.
Burns and the loss of consciousness are a couple of the symptoms of electrical injury.
A capacitor bank charged to a high voltage is discharged into the gas at one tube end to ionize and heat the gas, producing a shock wave that may be studied as it travels down the tube.
2. A precision low-value resistor placed across the terminals of an ammeter to increase its range by allowing a known fraction of the electric-circuit current to go around the meter.
2. A device made of a long wire which has been wound around many times into a tightly packed coil.
It has the shape of a long cylinder and if a current is sent through a solenoid made of insulated wire and having a length much greater than its diameter, a uniform magnetic field will be created inside the solenoid.
This field can be intensified by inserting a ferromagnetic core into the solenoid.
Electric sparks play an important part in many physical effects; usually these are harmful and undesirable effects, ranging from the gradual destruction of contacts in a conventional electrical switch to the large-scale disruption resulting from lightning discharges.
Sometimes the spark is useful; for example, its function in the ignition system of an automobile, its use as an intense short-duration illumination source in high-speed photography, and its use as a source of excitation in spectroscopy.
The portable battery-powered machine does not correct scoliosis (abnormal lateral curvature of the spine); however, it apparently does keep it from getting worse.
A stacker is a machine for lifting merchandise on a platform or fork and arranging it in tiers; operated by hand, electric, or hydraulic mechanisms.
One of the most effective means for accomplishing this action is a gaseous tube energized by the discharge of an electrical condenser.
Flashes as short as one microsecond have been produced in this procedure.
It has a thermocouple, resistance wire, or thermistor as the temperature-sensitive element.
2. The end of a line where signals are either transmitted or received, or a point along the length of a line where the signals are made available to an apparatus: Randy, the fired train conductor, attempted to disrupt the electric terminals at the railroad station so the trains could not run on time.
A thermocouple is a thermoelectric device used to measure temperatures accurately, especially one consisting of two dissimilar metals joined so that a potential difference generated between the points of contact is a measure of the temperature difference between the points.
One junction is at the temperature to be measured, the second is at a fixed temperature. The electromotive force generated depends upon the temperature difference.
Electricity is also used in the movement of vehicles in other ways, but these forms are not usually included in the category of electric traction; examples include, battery-powered electric automobiles, battery-propelled vans for city delivery or warehouse use, and modern diesel-electric locomotives in which the wheels are driven by electric motors powered by diesel engines.
Vehicle-type alarm systems can usually detect electric transients in such activities, as starting the engine or opening a door, which can initiate a courtesy light that indicates a disturbance in the circuit that can result in making a warning alert.
2. The process of selecting a desired frequency on a component; such as, a receiver, a transmitter, or an oscillator, without using mechanical devices.
Three different systems of electric units are used:
- The electromagnetic unit.
- The electrostatic unit.
- The ordinary or practical units.
The commonly used practical units are the ampere or unit of current, the volt or unit of electromotive force, the ohm or unit of resistance, the coulomb or unit of quantity, the farad or unit of capacitance, and the watt or unit of power.
2. The force on a stationary positive electrical charge per unit charge at a point in an electric field.
It is usually measured in volts per meter.
2. Any ground vehicle whose original source of energy is electric power; such as, an electric car or an electric locomotive.
2. A system of electric conductors and components for conveying electric power from a source to the point of use.
In general, electric wiring for light and power must convey energy safely and reliably with low power losses, and must deliver it to the point of use in an adequate quantity at a rated voltage.
Electric wiring systems are designed to provide a constant voltage to the load within the capacity limits of the system.
Made of two plates separated by a thin insulator or sometimes air, when one plate is charged negative and the other positive, a charge builds up and remains after the current is removed.
When electric power is required, the circuit is switched to conduct current between the plates, and the electrical charge is released.2. An electronic component that stores an electric charge and releases it when required.
It comes in a huge variety of sizes and types for use in regulating power as well as for conditioning, smoothing, and isolating signals.
Capacitors are made from many different materials, and just about every electrical and electronic system uses them.
2. An infrequent disturbance of the electric field in the lower atmosphere caused by strong winds and the blowing of dust, but without thunderstorm activity.
3. Any meteorological disturbance in which the air is highly charged with electricity, occurring in fine weather, without clouds or rain, and often accompanied by dry, dusty winds.
4. A sudden change in the pattern of earth currents, causing interference with radio reception.
5. A meteorological condition marked by an intense electric field within a cloud or clouds.
2. Welding in which the joint is heated to fusion by an electric arc or by a large electric current.
3. The joining of metal components by fusing them with heat from an electrical arc struck between two electrodes.
There is no electrolyte, but the work is submerged in oil to flush away eroded particles and to delay each spark until peak energy is built up.>
Its therapeutic effect depends on the heat from the electric lights.
2. A method of removing warts or polyps by placing a needle or wire loop heated by a direct galvanic current on the tissue to be removed.
2. A hand-held, needle-like cautery heated by an electric current.
3. The application of a needle or snare heated by electric current for the destruction of tissue; such as, for removing warts or polyps (benign tumors) and cauterizing small blood vessels to limit blood loss during surgical procedures.
4. The process of cutting and cauterizing skin simultaneously, or coagulating blood from vessels around a surgical incision by using an electrical-cautery instrument.
5. Cauterization using platinum wires heated to red or white heat by an electric current, either direct or alternating.
Chorea consists of jerky spasmodic movements of the limbs, trunk, and facial muscles, common to various diseases of the central nervous system.2. A progressively fatal spasmodic disorder, possibly of malarial origin, occurring chiefly in Italy.
It is a severe form of Sydenham's chorea, in which the spasms are rapid and of a specially rapid, jerky character.
Sydenham's chorea is a neurological disease of children and pregnant women, sometimes following rheumatic fever, in which those affected experience involuntary jerking movements of the body and it is also defined as an acute neurologic disorder that emerges several months following a streptococcal ("strep") infection.
It is named after Thomas Sydenham (1624-1689), English physician.
2. A tank in which voltages are applied to an enlarged scale model of an electron-tube system or a reduced scale model of an aerodynamic system immersed in a poorly conducting liquid.
The equipotential lines between electrodes are traced with measuring probes, as an aid to electron-tube design.
It is also used as an aid to electron-tube design or in computing ideal fluid flow.
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).
2. A process by which materials that conduct electricity can be removed from a metal by an electric spark.
It is used to form holes with different shapes in materials that have poor machine operations.
2. An instrument which converts light into electrical energy or uses it to regulate a flow of current, often incorporated into automatic control systems for doors and lighting.
3. An electronic device having an electrical output that varies in response to incident radiation; especially, to visible light.
4. A small cathode-ray tube having a fluorescent pattern whose size varies with the voltage applied to the grid.
It is used in radio receivers to indicate accuracy of tuning and as a modulation indicator in some tape recorders.5. An electric eye can operate a mechanism so as to open a door when its invisible beam is interrupted by the approach of a person and includes a photoelectric cell which is used as an automatic controlling appliance.
It is also used in motion pictures, television, and many other industries.
The statements of these four equations are as follows:
- Electric field diverges from electric charge.
- There are no isolated magnetic poles.
- Electric fields are produced by changing magnetic fields.
- Circulating magnetic fields are produced by changing electric fields and by electric currents.
Maxwell based his description of electromagnetic fields on these four statements.
2. A method of pain control with the application of electric impulses to the nerve endings.
This is done through electrodes which are placed on the skin and attached to a stimulator with flexible wires.
The electric impulses which are generated are similar to those of the body; however, they are different enough to block the transmission of pain signals to the brain making this procedure noninvasive and nonaddictive, and with no known side effects.
The electrons in some atoms; such as, copper and aluminum, are free to move and to jump from one atom to another and such materials are known as conductors.
Other materials; such as, wood, do not contain as many moving electrons, and so they are called insulators and when a material is neither completely a conductor nor an insulator, it is called a semiconductor.
When an electric current moves continuously in one direction, it is called a direct current and when the current fluctuates rapidly back and forth, it is called an alternating current.
Alternating current is used in almost all worldwide household wiring today while direct current is commonly seen in battery-operated devices.
Electric energy is measured in kilowatt hours.
The electric generation industry includes the "electric power sector" (utility generators and independent power producers) and industrial and commercial power generators, including combined-heat-and-power producers, but excluding units at single-family dwellings.
An electric motor converts electrical energy into mechanical energy.