Note 1 to entry: AC loss includes time-averaged hysteresis loss of the superconductor, a coupling current loss and an eddy current loss of the conductor, and an eddy current loss of the structural material.

Note 2 to entry: AC loss customarily also includes the power dissipated in the normal matrix of a superconductor or the structural material owing to the application of transient changes in magnetic field or current.

Note 3 to entry: This entry was numbered 815-13-52 in IEC 60050-815:2015.