Answer to Question #317754 in Electricity and Magnetism for joe

Question

A potential difference of 100 V is applied to the primary coil of a transformer. The current through the primary coil is 2.0 A. The potential difference across the secondary coil is 15 V

Calculate the current flowing through the secondary coil.

Answer 1

Let us assume transformer is ideal, so

$P_s=P_p\\ I_sV_s=I_pV_p$

The current in the secondary coil

$I_s=\frac{I_pV_p}{V_s}=\frac{2.0\times 100}{15}=13\:\rm A$