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Ampère  (French) 
  n André Mari (<PH:B><PH:d><PH:r><PH:e> <PH:m><PH:a><PH:r><PH:i>). 1775--1836, French physicist and mathematician, who made major discoveries in the fields of magnetism and electricity 

ampere 
  n 
1 the basic SI unit of electric current; the constant current that, when maintained in two parallel conductors of infinite length and negligible cross section placed 1 metre apart in free space, produces a force of 2x10--7 newton per metre between them. 1 ampere is equivalent to 1 coulomb per second 
2 a former unit of electric current (international ampere); the current that, when passed through a solution of silver nitrate, deposits silver at the rate of 0.001118 gram per second. 1 international ampere equals 0.999835 ampere, (Abbrev)  amp  (Symbol)  A 
  (C19: named after A. M. Ampère) 
ampere-hour 
  n a practical unit of quantity of electricity; the quantity that flows in one hour through a conductor carrying a current of 1 ampere. 1 ampere-hour is equivalent to 3600 coulombs, (Abbrev.)  a.h 
ampere-turn 
  n a unit of magnetomotive force; the magnetomotive force produced by a current of 1 ampere passing through one complete turn of a coil. 1 ampere-turn is equivalent to 4<Gpi>/10 or 1.257 gilberts, (Abbrevs.)  At, A 
volt-ampere 
  n the product of the potential in volts across an electrical circuit and the resultant current in amperes, (Abbrev.)  VA 



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