Task id16582

It is required to reduce the voltage from U1 = 6 kV to U2 = 120 V using an autotransformer having w1 = 3000 turns. Secondary winding resistance r2 = 0.5 Ohm. Resistance of the external circuit (in the reduced voltage network) R = 12 Ohm. What number of turns of transformer w2 should be connected to the reduced voltage network? Neglect the resistance of the winding through which the high voltage current passes.