Question

in a step up transformer no of turns in primary and secondary coils are n1 and n2 then

Answer 1

first of all, Let's see what is primary coil and what is secondary coil ?

If a coil is connected to an AC input voltage which is known as “ primary coil" and the other coil is connected to an AC output circuit with a load resistance which is known as “ secondary coil ".

Transformer can either step - up or step - down , in step-up transformer, number of turns of secondary coil is greater than number of turns of primary coil whereas in step - down transformer, number of turns of primary coil is greater than number of turns of secondary coil.

hence, in a step up transformer no of turns in primary and secondary coils are $n_1$ and $n_2$ then $n_1 < n_2$ .