The voltage of primary and secondary coil of transformer is same?And current is same or not?

1 Answer
Feb 7, 2018

Generally both voltage and current will change from primary to secondary coils.


What will remain constant (assuming 100% efficiency) is the power on both sides, and power is the product of current and voltage (I.e. #P = IxxV#) so if the voltage rises (a step-up transformer) current must fall and vice versa.

The most useful equation (again assuming it is efficient) is the ideal transformer equation: #N_1/N_2 = V_1/V_2# and the currents follow as a result to keep power constant.