absorbed dose absorbed dose rate absorber absorber plate absorber rod absorptance absorption column absorption factor absorption gasoline absorption rod absorption tower abundance accidental voltage transfer accident shield accountability Accumulated dose accumulation AC current a.c. current acidifying deposition acidisation acidization acid rain acid treatment acid well treatment acknowledgement switch AC network a.c. network acoustical well logging acoustic enclosure acoustic well logging acre-foot acre-yield AC supply a.c. supply actinometer activating agent activator active energy active laboratory active loop active material active network active power active solar heating active solar system active system actual consumption adaptive control additive admittance aerated burner aerial conductor aerial lift device with insulating arm aerobic digestion aerobic fermentation

aerofoil drag aerogenerator aerogenerator farm aeroturbine afterbay reservoir after-heat after-power agglomerate air classification air contamination indicator air contamination meter air contamination monitor air-cooled solar collector air drilling air jet evaporation test air line air pulsating jig alarm indicator albedo alkylation allobar alpha emitter alpha particle alpha radiation alpha radiator alpha rays alternate current supply alternating current alternating current network alternating current supply alternating voltage ambar ambient wind speed American pump ampere anaerobic digestion anaerobic fermentation anergy angle drilling angle of deviation between two electromotive forces angle of deviation between two e.m.f.'s annual storage anthracite antiknock fuel aperture aperture area aperture cover API gravity apparent power apparent viscosity aquifer aquifer arch dam arc-suppression-coil-earth neutral system area mining

aromatic crude oil array artificial pollution test ash ash content ash fusibility asphalt base petroleum asphaltic petroleum assembly for failed fuel element localisation assembly for failed fuel element localization associated gas associated phase layout asynchronous link atom atomic energy Atomic Energy Commission atomic nucleus atomic number atomic pile atomic reactor attended substation auger mining authorised maximum demand authorized maximum demand auto-consumption auto diesel oil autogenous ignition temperature auto-ignition temperature automatic control assembly automatic control system automatic multiple shot reclosing automatic reclosing auto-produced energy autoradiography auxiliary generator auxiliary switchboard auxiliary transformer auxiliary transformer of a power station auxiliary transformer of a unit availability factor available capacity available energy available energy supply available power average price per kilowatt-hour average price per kWh average year avgas aviation gasoline aviation turbine fuel avoidable costs