Question

A power transmission line feeds input power at 2.3 kV to a step down transformer with its primary winding having 3000 turns. The output power is delivered at 230 V by the transformer. The current in the primary of the transformer is 5A and its efficiency is 90%. The winding of transformer is made of copper. The output current of transformer is _____ A.

Answer 1

Correct answer is : 45

\(P_i = 2300 \times 5 \,watt\)

\(P_0 = 2300 \times 5 \times 0.9 = 230 \times I _2\)

\(I_2 = 45 A\)