one complete convolution of a conducting coil, through which one ampere of current passes.
2.
the magnetomotive force produced by one ampere passing through one complete turn or convolution of a coil.
Abbreviation: At.
Origin
1880-85
British Dictionary definitions for ampere-turn
ampere-turn
noun
1.
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 4π/10 or 1.257 gilberts Abbreviation At, A