Question

establish the relation ip/is=Ns/Np​

Answer 1

electrical power input = electrical power output

Primary current x primary voltage = secondary current x secondary voltage

Ip x Vp = Is x Vs

ip/is = Vs/Vp=Ns/Np

 In a STEP-UP transformer, the VOLTAGE is

INCREASED and the CURRENT is DECREASED.

 In a STEP-DOWN transformer, the VOLTAGE is

DECREASED and the CURRENT is INCREASED.