Chapter 21, Problem 26P

To determine

Number of turns in the secondary coil.

Answer to Problem 26P

Solution:

Number of turns in secondary coil is 17077 turns (Approximately)

Explanation of Solution

Given info:

$\begin{array}{l} V_p=\text{117 V}\hfill \\ N_p=148 \hfill \\ V_s=\text{13500 V }\hfill \end{array}$

Formula used:

According to transformer’s turns ratio,

$\begin{array}{l}\frac{N_p}{N_s}=\frac{V_p}{V_s}\\ \Rightarrow N_s=N_p\frac{V_s}{V_p}\end{array}$

Calculation:

Applying value in turn ratio formula,

$\begin{array}{l}{N}_s=148\left(\frac{13500}{117}\right)\\ \text{ =17076}\text{.92}\\ \text{ =17077 turns}\left(\text{Approximately}\right)\end{array}$