Question

A transformer has 175 turnings on the primary coil and 3000 turnings on the secondary coil. If the output voltage is 4000 V, what is the input voltage?

Answer 1

Ok
e(p) = primary coil voltage(input voltage)
e(s) = secondary coil voltage(output voltage)=4000 V
Ns =Number of turns of secondary =3000
Np = Number of turns of primary=175
therefore
From the principle of the transformer
e(s)/e(p) = Ns/Np
implies
4000/e(p) = 3000/175
e(p) = 4000*175/3000
e(p) = 233.3 V(Answer)
So thats the required input voltage
Keep me posted if its the correct answer, i m pretty sure it is :)