电气英语证书考试(pec)-电气工程专有名词2

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1、电气英语证书考试(PEC)-GlossaryofElectricalEngineeringTerms2A*absolutevalue Valueofanexpressionwithoutregardtosignorphaseangle.*absolutezero Thetemperaturewherethermalenergyisatminimum.-273.15�Cor0Kelvin.*ac [seealternatingcurrent]*accessory Adevice,otherthancurrentusingequipme

2、nt,associatedwithsuchequipmentorwiththewiringofaninstallation.*acceleration Rateofchangeofvelocity.[Unit:m/s2]*accelerationduetogravityg Accelerationofabodyfallingfreelyinavacuumasaresultofthegravitationalpulloftheearth.g=9.807m/s2*accumulator Storagebatteryorsecondary

3、cellforstoringelectricity.*accuracy Specifiesthenearnessofthemeasuredvaluefromthetruevalue.*acid Containinganexcessofhydrogenionsoverhydroxylions.*acoustics Studyofsound.*acpotentiometer Anapparatusforthecomparisonofa.c.voltages.Balancerequiresboththemagnitudeandthepha

4、seangleoftheunknownvoltagetobebalancedwiththeknownvoltage.Thismaybedoneeitherincartesianformorinpolarform.*acre UnitofareaintheImperialsystem.1acre=4047m2 =0.4047hectares*activeelement Anelementcapableofgeneratingelectricalenergy.*activefilter Anyfilterusinganopampisca

5、lledanactivefilter.*actuator Mechanicalpartofalimitswitchthatusesmechanicalforcetoactuatetheswitchcontacts.*acuteangle Anangleoflessthan90o.*address Thenumberthatuniquelyidentifiesthelocationofawordinmemory.*adiabatic processtakingplacewithoutheatenteringorleavingthesy

6、stem.*admittance Reciprocalofimpedance.Ratiooftheelectriccurrenttothevoltage.[Unit:siemensorS]*aerodynamics Studyofairmovingaroundsolidobjects,orairflowingaroundastationarystructure.*airconditioning Thecontroloftemperature,humidityandthepurityoftheair.Intropicalcountri

7、eslikeSriLanka,airconditioningonlycoolstheairandnotheatsit,butincoldcountriesbothmodesareavailable.*algebraicsum Totalofanumberofquantitiesofthesamekind,withdueregardtosign.*algorithm Asystematicmathematicalprocedurewhichenablesaproblemtobesolvedinadefinitenumberofstep

8、s.*alkaline Containinganexcessofhydroxylionsoverhydrogenions.*alloy Acompositionoftwoormoremetals.*alphanumeric Theco