electrodynamic ammeter

electrodynamic ammeter

[i‚lek·trō·dī′nam·ik ′a‚mēd·ər]
(engineering)
Instrument which measures the current passing through a fixed coil and a movable coil connected in series by balancing the torque on the movable coil (resulting from the magnetic field of the fixed coil) against that of a spiral spring.