Question

The ratio of the number of turns in the primary and the secondary coil of a step-up transformer is 1 : 200. It is connected to A-C mains of 200 V. Calculate the voltage developed in the secondary. Determine the current in the secondary, when a current of 2.0 A flows through the primary.

Answer 1

If N_p and N_s be the number of turns in  the  primery and the secondary coils respectively. and V_p and V_s be the primary and the voltages, then we have

Suppose, the currents through the primary and the secondary are i_p and i_s respectively. Then, assuming that the transformer is  'ideal', we have