Question

A transformer has efficiency of 80 percent. it works at 4kW and 100volt. if the secondary voltage is 240volt, calculate the primary and secondary currents.

Answer 1

here efficiency is 80℅ and the transformer works on 4kw =4000wand 100 volt
current on secondary coil 240 volt
current in primary coil 8
I1=e2*i2\e1 which refers to e2 =4kw i2 =100 volt and e1 =240 volt