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1、PEC电气工程专业英语证书考试-Glossary of Electrical Engineering Terms4Auto ranging:A DMM that automatically selects the range with the best resolution and accuracy in response to the application.AAC:Amps alternating currentAC/DC:A switch designated for use with either Alternating Current (AC) or Direct Current (
2、DC).AC Only:A switch designated for use with Alternating Current (AC) only.AC Power:AC stands foralternating current, which is an electrical current that frequently reverses direction. AC electricity is measured according to itscycles, with one complete cycle being counted each time a given current
3、travels in one direction and then doubles back on itself. An electrical current is able to complete many cycles per second, and is then given its frequency rating based on that number; for example, the typical frequency in North America is 60 hertz (Hz), which indicates that the current is performin
4、g 60 cycles per second. AC power is the type of electricity most commonly used in homes and offices, and is extremely versatile because its voltage can be changed through a transformer to suit a variety of transmission needs.ADC:Data converting from analog to digital format.AL/CU:30A, 50A or 60A rec
5、eptacles designated for use with aluminum or copper circuit conductors, identified by AL/CU stamped on the device. Receptacles without this designation must never be used with aluminum circuit conductors.Active Power:Also known as Real Power or simply Power. Active power is the rate of producing, tr
6、ansfer or using electrical energy. Measured in watts and often-expressed in kW or MW.Adapter:An accessory used for interconnecting non-mating devices or converting an existing device for modified use.Ampere (Amp):The ampere, oramp, is the measure of an electrical current in a given circuit. A single
7、 amp is equal to 6,280,000,000,000,000,000 electrons passing a specific point in one second.Amplitude:A non-negative scalar measure of a waves magnitude of oscillation, that is, the magnitude of the maximum disturbance in the medium during one wave cycle.Analog Meter:A mechanical measuring device us
8、ing a needle moving across a graduated scale or dial.Angle:A plug or connector that allows the attached flexible cord to exit at right angles.Arc Fault:Arcing faults are one of the major causes of these fires. When unwanted arcing occurs, it generates high temperatures that can ignite nearby combust
9、ibles such as wood, paper, and carpets. Arcing faults often occur in damaged or deteriorated wires and cords. Some causes of damaged and deteriorated wiring include puncturing of wire insulation from picture hanging or cable staples, poorly installed outlets or switches, cords caught in doors or und
10、er furniture, furniture pushed against plugs in an outlet, natural aging, and cord exposure to heat vents and sunlight.Arc Fault Circuit Interrupter (AFCI):AFCIs are newly-developed electrical devices designed to protect against fires caused by arcing faults in the home electrical wiring.THE FIRE PR
11、OBLEM:Annually, over 40,000 fires are attributed to home electrical wiring. These fires result in over 350 deaths and over 1,400 injuries each year1. Arcing faults are one of the major causes of these fires. When unwanted arcing occurs, it generates high temperatures that can ignite nearby combustib
12、les such as wood, paper, and carpets. Arcing faults often occur in damaged or deteriorated wires and cords. Some causes of damaged and deteriorated wiring include puncturing of wire insulation from picture hanging or cable staples, poorly installed outlets or switches, cords caught in doors or under
13、 furniture, furniture pushed against plugs in an outlet, natural aging, and cord exposure to heat vents and sunlight.HOW THE AFCI WORKS:Conventional circuit breakers only respond to overloads and short circuits; so they do not protect against arcing conditions that produce erratic current flow. An A
14、FCI is selective so that normal arcs do not cause it to trip. The AFCI circuitry continuously monitors current flow through the AFCI. AFCIs use unique current sensing circuitry to discriminate between normal and unwanted arcing conditions. Once an unwanted arcing condition is detected, the control c
15、ircuitry in the AFCI trips the internal contacts, thus de-energizing the circuit and reducing the potential for a fire to occur. An AFCI should not trip during normal arcing conditions, which can occur when a switch is opened or a plug is pulled from a receptacle. Presently, AFCIs are designed into
16、conventional circuit breakers combining traditional overload and short-circuit protection with arc fault protection. AFCI circuit breakers (AFCIs) have a test button and look similar to ground fault circuit interrupter (GFCI) circuit breakers. Some designs combine GFCI and AFCI protection. Additional AFCI design configurations are anticipated in the near future. It is important to n
