Question

A transformer steps up an ac supply from 220 to 2200 V. If the secondary coil of the transformer has 2000 turns, Then find the number of turns in its primary coil.

Answer 1

Given

Voltage across the primary winding, $V_1=220V$

Voltage across the secondary winding, $V_2=2200V$

Number of turns in the secondary coil, $N_2=2000$

We have to find the number of turns in the primary coil $\left(N_1\right)$

We have

$\frac{N_1}{N_2}=\frac{V_1}{V_2}$

$\frac{N_1}{2000}=\frac{220}{2200}$

$2200N_1=440000$

$N_1=\frac{440000}{2200}=200$

Hence the number of turns in primary coil is 200