at 1800rpm, 1000, 12.5A
efficiency of 80%, please find power factor, phase difference and output torque.
No. 4 (3 points) For a multiple secondary transformer, R1, R2 and R3 are loads to the 3
secondary windings (with n1, n2, n3 turns). Primary winding has n0 turns. Derive the
relationship of equivalent primary resistance R with R1, R2 and R3.