Definition(s)
Ampere-Turn
Unit of magnetomotive force which is the product of the number of turns in a coil and the quantity of amperes of current flowing through it, representing the magnetizing strength of the coil. EXAMPLE 800 A in a 6-turn coil gives 4 800 ampere-turns.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards