Answer to Question 5

 Back

(a)  Use P=IV.  I = P V = 500 106 W 15000 V = 33 300 A

(b) The secondary current = 500 106 W 275000 V = 1820 A

(c) Turns ratio:  assume that the primary is 1 turn.

        Nprim/Nsec = Vprim/Vsec

        1/Nsec = 15000 275000 = 5.45 10-2

        Nsec = 1/5.45 10-2 = 18.3

        Turns ratio Primary : Secondary = 1 : 18.3, or in whole numbers, 3 : 55